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English definition of “backup”

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backup

noun uk   /ˈbæk.ʌp/ us  
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.
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backup

adjective [only before noun] uk   /ˈbæk.ʌp/ US ( UK backing) us  
supporting the main singer, performer, etc : backup vocals Beyoncé's backup dancers
(Definition of backup from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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