B1 Prepositions 20 min read Medium

How to Use 'Back Up' (Move, Support, Save)

Mastering back up means understanding its diverse meanings and how context shapes its use.
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Grammar Rule in 30 Seconds

'Back up' means to move backward, support someone, or save a copy of digital files.

  • Use it for physical movement: 'Please back up the car.'
  • Use it for emotional or logical support: 'I will back you up.'
  • Use it for technology: 'Always back up your photos.'
👤 + back + (object) + up 🔙/🤝/💾

Overview

"Back up" is a very common word. It is important to learn. It has many different uses in English.

It can mean to help someone. It can mean to move backward. You can copy computer files. It also means traffic is slow.

This guide helps you use it. You will learn how to use it correctly.

How This Grammar Works

Sometimes you use "back up" with a person or thing. For example: "Back up your files."
Sometimes the word works alone. For example: "The car backed up."
You can put words in the middle. You can say "back up your work." You can say "back your work up."
With small words like "it," put the word in the middle. Say "back it up." Do not say "back up it."
When you move a car, keep the words together. Say "The car backed up." No word goes in the middle.
Learn these rules to speak well. This helps people understand you clearly.

Formation Pattern

1
Follow these rules for the right word order. The word order is very important.
2
1. Using "back up" alone. Keep the words together.
3
Use this for cars moving back. Use it for slow traffic. Do not put words in the middle.
4
| Meaning | Rule | Example | Why |
5
| :------------------------------ | :---------------------------------- | :----------------------------------------------------------------------------------- | :--------------------------------------------------------------- |
6
| Move backward (physical) | back up | The delivery truck had to back up to access the loading dock. | The truck itself performs the backward movement; no external object is acted upon. |
7
| Traffic is slow | back up | Traffic started to back up. | It describes the cars. |
8
| Accumulate, get delayed (work) | back up | My emails really backed up while I was on holiday. | The emails accumulated themselves; it's an inherent state of becoming delayed. |
9
2. Using "back up" with a name or thing.
10
You can put the name in the middle. You can put it at the end. Both ways are correct.
11
| Meaning | Pattern 1 | Pattern 2 | Example 1 | Example 2 |
12
| :------------------------------ | :------------------------------------ | :-------------------------------------- | :------------------------------------------------------------- | :------------------------------------------------------------- |
13
| To help | back (name) up | back up (name) | He backed his friend up. | He backed up his friend. |
14
| Copy files | back (thing) up | back up (thing) | Back your files up. | Back up your files. |
15
| Give help | back (person) up | back up (person) | Friends back the girl up. | Friends back up the girl. |
16
3. Using "back up" with words like "me" or "it."
17
You MUST put these small words in the middle. This is a very important rule. It sounds natural.
18
| Meaning | Rule | Correct | Wrong | Why |
19
| :------------------------------ | :------------------------------------- | :----------------------------------------------------- | :----------------------------------------------------------- | :------------------------------------------------------------------------------------------------------- |
20
| To help | back (me) up | Please back me up. | Please back up me. | "Me" goes in the middle. |
21
| Copy files | back (it) up | Did you back it up? | Did you back up it? | "It" goes in the middle. |
22
Help someone. Use "back you up." Put the person in the middle.
23
Put words like "me" or "it" in the middle. This is important.

When To Use It

This phrase has many meanings. It means moving, helping, or copying files.
1. To Move Backward (Physical Movement):
Use it to move a car backwards. People can also do this.
  • The driver slowly backed up his car into the narrow parking spot, trying to avoid hitting the cones. This implies a careful, intentional reversal of movement.
  • Could you back up a little? You’re standing too close to the edge of the stage, and the performers need space. Here, it’s a direct instruction for a person to move away from a designated area.
  • The forklifts had to back up momentarily to let the larger delivery truck pass through the busy warehouse aisle. The action is necessary for navigating restricted spaces.
2. To Support, Confirm, or Corroborate (Abstract Reinforcement):
This meaning is used when you provide assistance, evidence, or moral support to a person, statement, claim, or argument. It implies lending credibility, strength, or active help to someone or something.
  • During the heated debate, her research team was able to back up her bold assertions with concrete statistical data. This refers to providing verifiable, factual evidence to support a claim.
  • Don't worry about speaking up in the meeting; I'll back you up if the boss questions your decision about the project. This signifies offering moral and practical support to a colleague, perhaps by confirming their points or offering a shared perspective.
  • The surprise witness's testimony unexpectedly backed up the detective's controversial theory about how the incident occurred. This confirms a hypothesis or idea with additional, credible information.
3. To Create a Copy of Digital Data (Replication for Safety):
Copy your digital files. This keeps your photos and work safe.
  • It's absolutely crucial to regularly back up your important files to an external hard drive or cloud storage to prevent irreversible data loss. This is a common piece of advice for cybersecurity and data integrity.
  • I forgot to back up my phone before installing the new operating system update, and now I've lost all my contacts and photos. This illustrates a costly mistake resulting from neglecting data replication.
  • Many modern cloud services automatically back up your photos and documents every night, providing peace of mind without manual intervention. This highlights the convenience and protective nature of automated digital backups.
4. To Become Congested or Obstructed (Accumulation leading to stoppage):
Use this when traffic stops. It means things are slow or blocked.
  • Heavy snow and a major accident caused traffic to back up for miles on the highway during the morning rush hour. This describes a literal physical obstruction leading to a queue of vehicles.
  • My workload has really backed up since I took a week off; I have so many tasks waiting for my attention. This refers to an accumulation of unfinished work, indicating a delay in processing.
  • If you don't regularly clear your computer's temporary files and cache, the system can start to back up and significantly slow down. This indicates a digital process becoming inefficient or obstructed due to an overload of temporary data.
Look at the other words. They help you know the meaning.

When Not To Use It

Do not use this phrase for everything. Sometimes it is wrong.
1. For General Saving of Non-Digital Items or Resources:
Do not use it for money. Use "save" or "store" instead.
  • Incorrect: ~I need to back up some money for retirement, so I'm putting 10% of my salary into savings.~
  • Correct: I need to save some money for retirement, so I'm putting 10% of my salary into savings. or I need to put aside some money for retirement.
  • Incorrect: ~We backed up extra food and water in the emergency kit.~
  • Correct: We stored extra food and water in the emergency kit. or We stocked up on extra food and water.
2. For Physically Holding Something Up to Prevent Falling:
It does not mean holding something heavy. Use "hold up" instead.
  • Incorrect: ~The broken fence post needs someone to back it up until we can fix it properly.~
  • Correct: The broken fence post needs someone to prop it up until we can fix it properly. or The broken fence post needs someone to hold it up.
3. As a Direct Synonym for 'Reverse' in All Contexts (Especially Abstract):
Use it for moving cars. Use "change" for plans or decisions.
  • Incorrect (if reversing a decision): ~The committee decided to back up the decision made last week after further review.~
  • Correct (if reversing): The committee decided to reverse the decision made last week after further review. or The committee decided to overturn the decision.
  • Correct (if supporting a decision): The committee decided to back up the decision made last week, reaffirming their commitment. (Note the distinct meaning of support here.)
4. When you give money or say you like an idea:
If you give money, use "pay for." Do not use "back up."
  • Incorrect: ~The government backed up the new local charity with a substantial grant.~ (While understandable, supported or funded is more exact.)
  • Correct: The government supported the new local charity with a substantial grant. or The government funded the new local charity.
Using the right words is good. It helps people understand you.

Common Mistakes

Many people make mistakes. Learn these rules to speak better.
1. Putting words in the wrong place:
People forget to put words like "it" in the middle.
  • Mistake: ~I will back up him if he needs help with his presentation.~
  • Correction: I will back him up if he needs help with his presentation.
  • Mistake: ~Did you back up it before the system update?~
  • Correction: Did you back it up before the system update?
  • Why it's wrong: As explained in the Formation Pattern, English phrasal verbs with pronoun objects demand the pronoun be placed between the verb and the particle. This is a fundamental structural rule that applies to many similar phrasal verbs (e.g., pick it up, turn them down, throw them out). Violating this rule creates ungrammatical sentences that sound highly unnatural to native speakers.
2. Confusing 'Back Up' (Support) with 'Stand By' or 'Stand Up For':
There are many ways to help. "Back up" is just one way.
  • Back up (support) often means to corroborate a statement, provide evidence, assist someone in an action or argument, or provide a backup plan. Example: My colleagues backed me up when I presented the new proposal by confirming my data.
  • Stand by typically means to be ready to assist, to remain loyal to someone, or to maintain a position despite opposition. Example: I'll stand by you no matter what challenges you face.
  • Stand up for means to defend someone or something from criticism, attack, or injustice. Example: You need to stand up for yourself when people criticize your work unfairly.
  • Mistake: ~He didn't stand up for me when I needed him to back up me in the argument.~ (Redundant and incorrect pronoun use).
  • Correction: He didn't stand up for me when I was being unfairly criticized. or He didn't back me up when I needed someone to confirm my story.
3. Overusing 'Back Up' for all forms of 'Saving':
This is for computer files. It is not for saving money.
  • Mistake: ~I'm trying to back up money each month to buy a new car.~
  • Correction: I'm trying to save money each month to buy a new car.
  • Mistake: ~Please back up this original historical document in the safe.~ (Unless you mean scanning it and storing a digital copy).
  • Correction: Please store this original historical document in the safe. or Please place this document in the safe.
4. Misinterpreting Contextual Meaning:
Look at the situation. A computer usually means copying files.
  • Consider the phrase: The system is backing up.
  • This could mean: The computer system is creating a copy of its data (correct and common).
  • Less likely: ~The computer system is moving backward.~ (Only if it's a physical robot).
  • Possible, but less direct: The computer system is becoming congested/slow. (slowing down or getting bogged down might be more common).
  • Always consider the surrounding words, the subject of the sentence, and the overall situation. For example, My workflow is backing up clearly refers to accumulation, not data copy or physical movement.

Common Collocations

Some words fit together. Learn these pairs to sound more natural.
1. For Digital Data Replication:
  • back up files
  • back up data
  • back up your computer/phone
  • back up documents/photos
  • back up to the cloud
  • back up to an external hard drive
  • regularly back up
  • automatic back up
2. For Support/Confirmation:
  • back up a claim/statement/story
  • back up an argument/theory
  • back up a colleague/friend/person
  • back up with evidence/data
  • back up someone's opinion
  • back up a witness
3. For Physical Movement:
  • back up a car/truck/vehicle
  • back up into a space
  • back up a few feet/meters
  • back up slowly/carefully
4. For Congestion/Accumulation:
  • traffic back up
  • workload back up
  • emails back up
  • pipes back up (in plumbing contexts, meaning a blockage)

Contrast With Similar Patterns

Learn how this is different. This helps you speak clearly.
1. Back Up (Support/Corroborate) vs. Support (General Assistance):
This means helping or proving something. "Support" is just general help.
  • He needed someone to back up his claim with a witness statement. (back up = provide evidence/confirmation).
  • His family supported him throughout his illness. (support = provide general care, emotional, or financial help).
  • Key difference: Back up is usually more specific about how the support is given (e.g., confirming a statement, offering an alternative in an argument), whereas support can be very general.
2. Back Up (Create Copy) vs. Save (General Storage):
This makes a copy. "Save" just keeps the work you are doing.
  • I always back up my entire hard drive to an external disk every month. (back up = create a redundant copy).
  • Remember to save your document frequently so you don't lose your progress. (save = write current state to primary storage).
  • Key difference: Back up implies redundancy and disaster recovery; save implies persistence of the current working state.
3. Back Up (Move Backward) vs. Reverse (General Turnaround):
Use this for moving. Use "reverse" to change a decision.
  • The car had to back up to avoid the obstacle in the road. (back up = controlled physical backward motion).
  • The court decided to reverse the earlier verdict. (reverse = overturn a decision).
  • Key difference: Back up is almost exclusively physical backward movement; reverse can be physical or abstract (e.g., reverse a trend, reverse a policy).
4. Back Up (Congest) vs. Catch Up (Reach Current Point):
Both involve a backlog, but in opposite directions. When things back up, they accumulate and cause delays. When you catch up, you deal with the accumulated work.
  • My emails really backed up while I was on holiday, creating a huge inbox. (back up = accumulate and cause a delay).
  • It took me a whole day to catch up on all my emails after my vacation. (catch up = process the accumulated work).
  • Key difference: Back up describes the state of accumulation/delay; catch up describes the action of addressing that accumulation.

Quick FAQ

Here are common questions about the words "back up."
Q1: Can I use "back up" with names and words like "it"?
Yes. You can say "back up files" or "back files up." But with "it," always say "back it up." Do not say "back up it."
Q2: Is back up always separable when it's transitive?
You can say "back up work" or "back work up." For "it," only say "back it up." Sometimes "back up" stays together, like "traffic backed up."
Q3: Does back up always imply a positive action?
No. Helping a friend is good. But "traffic backed up" is bad. It means there are too many cars and no space.
Q4: Is back up formal or informal?
Use "back up" at work and with friends. It is for computers, cars, and helping people.
Q5: Can back up mean to create a copy of a physical item?
Generally no, not in the sense of making an exact duplicate. You would use photocopy, duplicate, or make a copy of for physical documents. Back up is almost exclusively for digital data replication.
For instance, you wouldn't say back up this painting but rather make a copy of this painting or photograph this painting.
Q6: What is the difference between "back up" and "backup"?
"Back up" with a space is an action. "Backup" without a space is a thing. For example: "I have a backup plan."

Conjugating the Verb 'Back Up'

Tense Subject Form Example
Present Simple
I/You/We/They
back up
I back up my files.
Present Simple
He/She/It
backs up
She backs up the car.
Past Simple
All subjects
backed up
They backed me up.
Present Continuous
I
am backing up
I am backing up now.
Present Perfect
He/She/It
has backed up
He has backed it up.
Future (Will)
All subjects
will back up
We will back you up.

Contractions with 'Back Up'

Full Form Contraction Usage
I will back up
I'll back up
Common in speech
He is backing up
He's backing up
Common in speech
They have backed up
They've backed up
Common in speech

Meanings

A phrasal verb used to describe moving in reverse, providing support or evidence for someone, or creating a duplicate of computer data.

1

Physical Movement

To move backwards or cause a vehicle to move backwards.

“He had to back up because he missed the turn.”

“Could you back the truck up a little bit?”

2

Support/Verification

To support or help someone, or to provide evidence that a story is true.

“My family backed me up when I decided to quit my job.”

“The witness backed up the suspect's alibi.”

3

Computing/Data

To make a copy of information stored on a computer or device.

“It's important to back up your hard drive every week.”

“I forgot to back up my phone before it broke.”

4

Accumulation/Blockage

When something becomes blocked and forms a line or pile.

“Traffic is backed up for miles on the highway.”

“The sink is backed up and won't drain.”

Reference Table

Reference table for How to Use 'Back Up' (Move, Support, Save)
Form Structure Example
Affirmative
Subject + back up + Object
I back up my data.
Separated
Subject + back + Object + up
I back my data up.
Pronoun
Subject + back + pronoun + up
I back it up.
Negative
Subject + do not + back up
They don't back me up.
Question
Do + Subject + back up...?
Did you back up the car?
Passive (Traffic)
Subject + be + backed up
The road is backed up.

Formality Spectrum

Formal
The evidence corroborates your claim.

The evidence corroborates your claim. (Professional/Social)

Neutral
The data backs up your argument.

The data backs up your argument. (Professional/Social)

Informal
I'll back you up on that.

I'll back you up on that. (Professional/Social)

Slang
I got your back.

I got your back. (Professional/Social)

The Three Pillars of 'Back Up'

Back Up

Movement

  • Reverse Move the car backward

Support

  • Help Agree with a friend

Technology

  • Copy Save files to Cloud

Verb vs. Noun

Verb (Action)
back up Two words: 'I need to back up.'
Noun (Thing)
backup One word: 'I have a backup.'

Is it Separable?

1

Is the object a pronoun (me, it, them)?

YES
Must put it in the middle: 'Back it up'.
NO
You can put it in the middle OR at the end.

Common Objects for 'Back Up'

🚗

Vehicles

  • • Car
  • • Truck
  • • Van
💻

Digital

  • • Files
  • • Photos
  • • Hard drive
👥

People

  • • Friend
  • • Colleague
  • • Witness
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Examples by Level

1

Please back up the car.

2

Back up! You are too close.

3

The bus is backing up.

4

I back up my phone.

1

Did you back up your files yesterday?

2

I will back you up if you ask him.

3

The car backed up into the wall.

4

She is backing up her sister.

1

If you don't back it up, you might lose the data.

2

Traffic was backed up for three miles.

3

Can you back up your claim with evidence?

4

He backed the truck up very carefully.

1

The sewage started to back up into the basement.

2

I need you to back me up during the presentation.

3

The system automatically backs up every hour.

4

Wait, back up a second—what did you just say?

1

The witness's testimony failed to back up the prosecutor's theory.

2

Unless we back up our servers, we are at risk of a total blackout.

3

The sink is completely backed up; we need a plumber immediately.

4

He backed up his argument with a series of peer-reviewed studies.

1

The sheer volume of orders has backed up the entire supply chain.

2

One must always back up one's assertions in a scholarly dissertation.

3

The ideological shift was backed up by a massive propaganda campaign.

4

The drain backed up, causing an overflow of biblical proportions.

Easily Confused

How to Use 'Back Up' (Move, Support, Save) vs Back up vs. Back down

Learners think they are opposites, but 'back down' means to admit you were wrong in an argument.

How to Use 'Back Up' (Move, Support, Save) vs Back up vs. Back out

Both involve leaving, but 'back out' means to withdraw from a promise or agreement.

How to Use 'Back Up' (Move, Support, Save) vs Back up vs. Reverse

They mean the same thing in driving, but 'reverse' is more formal.

Common Mistakes

✗

Back up it.

✓

Back it up.

Pronouns must go between 'back' and 'up'.
✗

I back up to home.

✓

I went back home.

'Back up' is for reverse movement, not returning to a location.
✗

The car backs up the street.

✓

The car is backing up.

Use present continuous for actions happening now.
✗

He back up.

✓

He backs up.

Third-person singular 's' is still required.
✗

I need to backup my files.

✓

I need to back up my files.

The verb is two words; the noun is one word.
✗

She backed up me.

✓

She backed me up.

Pronoun placement error.
✗

Did you backed up?

✓

Did you back up?

After 'did', use the base form of the verb.
✗

The traffic is backing up.

✓

The traffic is backed up.

When describing the state of traffic, use the passive 'is backed up'.
✗

He backed up his friend for the money.

✓

He backed up his friend's story.

'Back up' means support a person or story, not provide money (that's 'bail out').
✗

I'll back up you in the meeting.

✓

I'll back you up in the meeting.

Pronoun placement.
✗

The data doesn't back up to the theory.

✓

The data doesn't back up the theory.

Do not use 'to' when 'back up' means 'support'. It is a transitive verb.

Sentence Patterns

I need to back up my ___.

Can you back me up when I ___?

The ___ is backed up.

You should back up your ___ with ___.

Real World Usage

Driving a car constant

Can you back up? I can't get out of the driveway.

IT Support very common

Did you back up your files before the crash?

Job Interview common

I can back up my experience with several certifications.

Texting a friend common

If you tell him you're busy, I'll back you up.

Traffic Report very common

Traffic is backed up on I-95 due to construction.

Plumbing occasional

The toilet is backed up again.

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💡

The Pronoun Rule

Always remember: 'Back it up', 'Back me up', 'Back them up'. The pronoun NEVER goes at the end.
⚠️

Verb vs. Noun

Use two words for the action (back up) and one word for the thing (backup). 'I need to back up my backup.'
🎯

Clarification

In a conversation, if someone is speaking too fast, say 'Wait, can we back up a second?' to ask them to repeat or explain.
💬

Support

In the UK and US, 'backing someone up' is a very positive trait. It shows loyalty.

Smart Tips

Check if you are using it as a verb or noun. If there is a 'to' before it, use two words.

I need to backup my files. → I need to back up my files.

Always put it in the middle. Think of the pronoun as being 'protected' by the two words.

Back up it. → Back it up.

Use 'back up' to show you agree with a colleague's data.

I agree with Sarah. → I'd like to back up Sarah's point with some recent data.

Use the past participle 'backed up' to describe the situation.

The traffic is backing. → The traffic is backed up.

Pronunciation

/bæk ʌp/ sounds like 'ba-kup'

Linking

In 'back up', the 'k' sound at the end of 'back' often links to the 'u' in 'up'.

Verb: back UP | Noun: BACKup

Stress

In the phrasal verb, the stress is usually equal or slightly more on 'up'. In the noun 'backup', the stress is on 'back'.

Rising on 'up' for questions

Can you back it up? ↗

Asking for a favor or clarification.

Memorize It

Mnemonic

Back Up: Move Back, Support a Buddy, Save a Binary.

Visual Association

Imagine a car reversing into a giant USB drive while a friend stands behind it giving a 'thumbs up.' This combines movement, data, and support.

Rhyme

To keep your data and your friend, back them up until the end!

Story

I was driving my car and had to back up because the road was blocked. I called my friend to back up my story to the police. Later, I went home to back up the photos of the accident.

Word Web

ReverseSupportCopyBackupEvidenceTrafficClog

Challenge

Write three sentences using 'back up' in three different ways: one about a car, one about a computer, and one about a friend.

Cultural Notes

In the US, 'backing up' is a standard part of the driving test. Using a 'backup camera' is now common, but the phrase remains the same.

In Western business culture, 'backing someone up' in a meeting is a sign of strong alliance and teamwork.

With the rise of ransomware, 'backing up' has become a cultural mantra for anyone using technology.

The phrase combines the adverb 'back' (meaning toward the rear) and the particle 'up' (often used in English to indicate completion or readiness).

Conversation Starters

“

How often do you back up your phone's photos?

“

Has a friend ever backed you up in a difficult situation?

“

What do you do when traffic is backed up on your way to work?

“

If you were in a debate, what kind of evidence would you use to back up your points?

Journal Prompts

Describe a time you had to back up a vehicle in a tight space.
Write about a person who always backs you up. Why do you trust them?
Discuss the importance of backing up digital data in the modern world.
Argue for or against a controversial topic and use 'back up' to describe your evidence.

Common Mistakes

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

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Test Yourself

Fill in the blank with the correct form of 'back up'.

I forgot to ___ my computer last night.

✓ Correct! ✗ Not quite. Correct answer: back up
We need the infinitive verb form after 'to'.
Which sentence is grammatically correct? Multiple Choice

Choose the correct pronoun placement.

✓ Correct! ✗ Not quite. Correct answer: Can you back me up?
Pronouns must go between the verb and the particle.
Find the mistake in the sentence. Error Correction

Find and fix the mistake:

The traffic is backing up for miles.

✓ Correct! ✗ Not quite. Correct answer: Change 'backing up' to 'backed up'
To describe the state of traffic, we use the passive 'is backed up'.
Put the words in the correct order. Sentence Reorder

Arrange the words in the correct order:

All words placed

Click words above to build the sentence

✓ Correct! ✗ Not quite. Correct answer: Please back up the car.
The standard order is Verb + Particle + Noun.
Match the meaning to the sentence. Match Pairs

Match each item on the left with its pair on the right:

✓ Correct! ✗ Not quite. Correct answer: 1-I'll back you up, 2-Back up the car, 3-Back up the files
Each sentence matches its respective sense.
Change the sentence to use a pronoun. Sentence Transformation

Back up the files.

✓ Correct! ✗ Not quite. Correct answer: Back them up.
'Files' is plural, so we use 'them' in the middle.
Is this rule true or false? True False Rule

'Backup' (one word) is always a verb.

✓ Correct! ✗ Not quite. Correct answer: False
'Backup' is a noun or adjective; 'back up' is the verb.
Complete the dialogue. Dialogue Completion

A: I'm going to tell the teacher that Mark cheated. B: Go ahead, I'll ___.

✓ Correct! ✗ Not quite. Correct answer: back you up
The speaker is offering support to 'you'.

Score: /8

Practice Exercises

8 exercises
Fill in the blank with the correct form of 'back up'.

I forgot to ___ my computer last night.

✓ Correct! ✗ Not quite. Correct answer: back up
We need the infinitive verb form after 'to'.
Which sentence is grammatically correct? Multiple Choice

Choose the correct pronoun placement.

✓ Correct! ✗ Not quite. Correct answer: Can you back me up?
Pronouns must go between the verb and the particle.
Find the mistake in the sentence. Error Correction

Find and fix the mistake:

The traffic is backing up for miles.

✓ Correct! ✗ Not quite. Correct answer: Change 'backing up' to 'backed up'
To describe the state of traffic, we use the passive 'is backed up'.
Put the words in the correct order. Sentence Reorder

up / car / the / back / please

✓ Correct! ✗ Not quite. Correct answer: Please back up the car.
The standard order is Verb + Particle + Noun.
Match the meaning to the sentence. Match Pairs

1. Support, 2. Movement, 3. Data

✓ Correct! ✗ Not quite. Correct answer: 1-I'll back you up, 2-Back up the car, 3-Back up the files
Each sentence matches its respective sense.
Change the sentence to use a pronoun. Sentence Transformation

Back up the files.

✓ Correct! ✗ Not quite. Correct answer: Back them up.
'Files' is plural, so we use 'them' in the middle.
Is this rule true or false? True False Rule

'Backup' (one word) is always a verb.

✓ Correct! ✗ Not quite. Correct answer: False
'Backup' is a noun or adjective; 'back up' is the verb.
Complete the dialogue. Dialogue Completion

A: I'm going to tell the teacher that Mark cheated. B: Go ahead, I'll ___.

✓ Correct! ✗ Not quite. Correct answer: back you up
The speaker is offering support to 'you'.

Score: /8

Practice Bank

12 exercises
Choose the best phrasal verb to complete the sentence. Fill in the Blank

The manager asked the intern to ___ the presentation with some recent market data.

✓ Correct! ✗ Not quite. Correct answer: back up
Complete the sentence with the correct form of 'back up'. Fill in the Blank

If you don't ___ your computer regularly, you risk losing important files.

✓ Correct! ✗ Not quite. Correct answer: back up
Identify and correct the mistake in the sentence. Error Correction

I will back up you if they try to blame you.

✓ Correct! ✗ Not quite. Correct answer: I will back you up if they try to blame you.
Correct the sentence for proper usage of 'back up'. Error Correction

She backed up her physical books in the attic.

✓ Correct! ✗ Not quite. Correct answer: She stored her physical books in the attic.
Which sentence correctly uses 'back up'? Multiple Choice

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: The car backed up quickly out of the garage.
Select the sentence that uses 'back up' idiomatically. Multiple Choice

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: His claims were backed up by solid evidence.
Translate into English: 'Necesito hacer una copia de seguridad de todos mis documentos importantes antes de que mi computadora se bloquee.' Translation

Translate into English: 'Necesito hacer una copia de seguridad de todos mis documentos importantes antes de que mi computadora se bloquee.'

✓ Correct! ✗ Not quite. Correct answer: ["I need to back up all my important documents before my computer crashes.","I need to back all my important documents up before my computer crashes."]
Translate into English: 'El gerente pidió al conductor que retrocediera el camión lentamente.' Translation

Translate into English: 'El gerente pidió al conductor que retrocediera el camión lentamente.'

✓ Correct! ✗ Not quite. Correct answer: ["The manager asked the driver to back up the truck slowly.","The manager asked the driver to back the truck up slowly."]
Put the words in order to form a correct sentence. Sentence Reorder

Arrange these words into a sentence:

✓ Correct! ✗ Not quite. Correct answer: I backed my files up to the cloud.
Arrange the words to form a grammatically correct sentence. Sentence Reorder

Arrange these words into a sentence:

✓ Correct! ✗ Not quite. Correct answer: His theory was not backed up by data.
Match the meaning of 'back up' to its example. Match Pairs

Match the meaning with the correct usage:

✓ Correct! ✗ Not quite. Correct answer: matched
Match the type of object with the correct 'back up' structure. Match Pairs

Match the object type with the correct structure:

✓ Correct! ✗ Not quite. Correct answer: matched

Score: /12

FAQ (8)

Yes, it is. You can say `back up the car` or `back the car up`. However, with pronouns, you must separate them: `back it up`.

In driving, they are the same. However, you cannot use 'reverse' to mean supporting a friend or saving computer files.

No, that is incorrect. You must say `back me up`.

Use it as a noun (`I have a backup`) or an adjective (`a backup plan`). Use two words for the action.

No. `Go back` means to return to a place. `Back up` means to move in reverse or to support someone.

It means there is a long line of cars that are moving very slowly or not at all, usually due to an obstacle.

It is neutral. It is perfectly fine to use in a business meeting or with friends.

Yes, if a drain is clogged and water is coming back out, we say the sink or toilet is `backed up`.

Scaffolded Practice

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Mastery Progress

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In Other Languages

Spanish low

Retroceder / Respaldar / Hacer una copia

English uses one phrasal verb for all three.

French low

Reculer / Soutenir / Sauvegarder

French verbs are not phrasal and don't share a root.

German moderate

Zurücksetzen / Unterstützen / Sichern

German uses separable prefixes but different base verbs.

Japanese moderate

バックする (Bakku suru) / 支援する (Shien suru)

The borrowed word 'bakku' doesn't apply to support or data in the same way.

Arabic low

يدعم (Yad'am) / يرجع (Yarja')

No single word or phrase covers all English meanings.

Chinese low

备份 (Bèifèn) / 后退 (Hòutiì)

The characters share no common elements.

Learning Path

Prerequisites

Previous
Delaying Tasks: How to use 'Put off'
Next
How to Use 'Cut Down On' (Reducing Habits)

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