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Definition: backup
(1)
A copy of data on external storage, another computer or in the cloud. The noun "backup" is one word. The verb "back up" is two words. See
backup software
,
backup types
,
backup storage
,
copy data
,
backup and restore
,
disaster recovery
and
LAN-free backup
.
(2)
Additional hardware resources ready to take over if the main system fails. See
fault tolerant
.
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