Definition of backup noun from the Oxford Advanced Learner's Dictionary

     

    backup

     noun
    noun
    BrE BrE//ˈbækʌp//
     
    ; NAmE NAmE//ˈbækʌp//
     
    [uncountable, countable]
     
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  1. 1extra help or support that you can get if necessary The police had backup from the army. We can use him as a backup if one of the other players drops out. a backup power supply
  2. 2 (computing) a copy of a file, etc. that can be used if the original is lost or damaged Always make a backup of your work. a backup copy see also back somethingup
  3. Extra examples The hospital has a backup power supply. The police called for backup from the army. We can use him as a backup if one of the team can’t play.
See the Oxford Advanced American Dictionary entry: backup

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