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English definition of “backup”

backup

noun     /ˈbækʌp/
SUPPORT [C, U] B2 extra help, support, or equipment that is available if you need it: Medical staff are on call to provide backup in case of an emergency.Helping and co-operating
COMPUTER [C] B2 an extra copy of computer information: to make a backup Computer concepts
(Definition of backup noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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