computer backup

Noun
  1. (computer science) a copy of a file or directory on a separate storage device (synset 102774845)
    "he made a backup in case the original was accidentally damaged or erased"
    referred to in: computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures
    is a type of: duplicate, duplication - a copy that corresponds to an original exactly
    same as: backup

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