computer backup

Thesaurus

Noun

1.

computer backup - (computer science) a copy of a file or directory on a separate storage device; "he made a backup in case the original was accidentally damaged or erased"backupduplication, duplicate - a copy that corresponds to an original exactly; "he made a duplicate for the files"computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures