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A backup is a copy of computer data taken and stored else where so that it may be used to restore the original after a data loss event. The backup copy allows the last version of the information accidentally lost to be recovered; in the event that the last backup copy is not kept, it is possible to recover the previous versions.

The most common media used for backup are a computer hard disk and optical media (CD, DVD). A computer can be ordered to save the files automatically on a regular basis.