backup Definition in the Cambridge English Dictionary
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Definition of “backup” - English Dictionary

Definition of "backup" - American English Dictionary

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backupnoun [C/U]

 us   /ˈbækˌʌp/

backup noun [C/U] (SUPPORT)

support or ​help, or someone or something that ​providessupport 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 ​ourcase.

backup noun [C/U] (EXTRA COPY)

an ​extracopy of ​information on a ​computer that is ​storedseparately: Did you make a backup of these ​files?
(Definition of backup from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "backup" - British English Dictionary

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backupnoun

uk   us   /ˈbæk.ʌp/
B2 [C or U] (someone or something that ​provides) ​support or ​help, or something that you have ​arranged in ​caseyourmainplans, ​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 ​organizesomewhere as a backup in ​case it ​rains. Remember, ​yourcolleagues are ​your backup system when things go ​wrong.B2 [C] a ​copy of ​informationheld on a ​computer that is ​storedseparately from the ​computer: Before we ​leavework 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.
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backupadjective [only before noun]

uk   us   /ˈbæk.ʌp/ US (UK backing)
supporting the ​mainsinger, ​performer, etc. : backup vocals Beyoncé's backup dancers
(Definition of backup from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "backup" - Business English Dictionary

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backupnoun [C or U]

(also back-up) uk   us   /ˈbækʌp/
a ​person, ​plan, ​piece of ​equipment, etc. that you can use to ​replace another if necessary: I use my other ​emailaccount 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 ​extracopy of the ​information on a ​computer, that is ​stored separately: Keep a backup of your ​data in ​case a ​drivefails.
(Definition of backup from the Cambridge Business English Dictionary © Cambridge University Press)
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