Backup and Restore SharePoint Sites with Stsadm.

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# Backup a site collection
#   stsadm –o backup –url <URL of the site collection> -filename <Name of the backup file>
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stsadm -o backup -url "http://intranet.net/sites/its/" -filename "c:its.dat"

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# Restore a site collection
#   > stsadm –o restore –url <URL of the site collection> -filename <Name of the backup file>
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stsadm -o restore -url "http://intranet.net/sites/its/" -filename "c:its.dat"

# NOTE: The backup and restore operations only work for top-level Web sites.