There are different types of data storage devices used for copying backups of data that is already in secondary storage onto archive files. An information repository model may be used to provide structure to this storage.

The data storage requirements can be large. Ī backup system contains at least one copy of all data considered worth saving.

Backups provide a simple form of disaster recovery however not all backup systems are able to reconstitute a computer system or other complex configuration such as a computer cluster, active directory server, or database server. Backups can be used to recover data after its loss from data deletion or corruption, or to recover data from an earlier time. The verb form, referring to the process of doing so, is ' back up', whereas the noun and adjective form is ' backup'.

In information technology, a backup, or data backup is a copy of computer data taken and stored elsewhere so that it may be used to restore the original after a data loss event.

For other uses, see Backup (disambiguation). This article is about duplicate data in computer systems for data recovery.

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