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English definition of “backup”

backup

noun [C/U] (SUPPORT)   /ˈbækˌʌp/
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.
(Definition of backup noun (SUPPORT) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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