Meaning of “backup” in the English Dictionary

"backup" in English

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uk /ˈbæk.ʌp/ us /ˈbæk.ʌp/

B2 [ C or U ] (someone or something that provides) support or help, or something that you have arranged in case your main plans, equipment, etc. go wrong:

We're going to need some professional backup for this project.
The party is going to be outdoors, so we'll need to organize somewhere as a backup in case it rains.
Remember, your colleagues are your backup system when things go wrong.

B2 [ C ] a copy of information held on a computer that is stored separately from the computer:

Before we leave work each day, we make a backup of all the records we have entered into the computer that day.
The department's backup disks are all stored in a different building.

[ C ] US a player who plays when the person who usually plays is not available:

He's a backup for the Dallas Cowboys.

More examples

backupadjective [ only before noun ]

uk /ˈbæk.ʌp/ us /ˈbæk.ʌp/ US UK backing

(Definition of “backup” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"backup" in American English

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backupnoun [ C/U ]

us /ˈbækˌʌp/

backup noun [ C/U ] (SUPPORT)

support or help, or someone or something that provides support or help:

a backup generator
They didn’t realize when they hired him that he had a backup band.
We want to have the factual backup to make our case.

backup noun [ C/U ] (EXTRA COPY)

an extra copy of information on a computer that is stored separately:

Did you make a backup of these files?

(Definition of “backup” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"backup" in Business English

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backupnoun [ C or U ]

also back-up uk /ˈbækʌp/ us

a person, plan, piece of equipment, etc. that you can use to replace another if necessary:

I use my other email account as a backup.
The company is exploring alternative sources to provide backup for materials when the suppliers cannot deliver.
Remember that your colleagues are your backup system when things go wrong.

IT an extra copy of the information on a computer, that is stored separately:

Keep a backup of your data in case a drive fails.

(Definition of “backup” from the Cambridge Business English Dictionary © Cambridge University Press)