Oxford Dictionary English

    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 backup in the Oxford Learner's Dictionary of Academic EnglishSee backup in the Oxford Advanced American Dictionary
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