backup

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backup

1 a duplicate computer, data file, equipment, or procedure for use in the event of equipment failure.
2 The act of creating another copy of a file, group of files, or an entire computer hard drive.

backup

Informatics A function that allows users to copy one or more files to a storage pool to protect against data loss. See Incremental backup, Mirroring, Selective backup. Cf Restore.

backup

Anything that serves to replace a function or system that fails.