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''{{Main article|Backup}}''
Important data stored on computers may be copied and archived securely so that, in the event of failure, the data and systems may be reconstructed. When major [http://ztssolutions.co.uk/ maintenance] such as [[Patch (computing)|patching]] is performed, a backup is recommended as the first step in case the update fails and [[Reversion (software development)|reversion]] is required.
[[Disk cleanup]] may be performed as regular maintenance to remove these. Files may become fragmented and so slow the performance of the computer. ''[[Disk defragmentation]]'' may be performed to combine these fragments and so improve performance.
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