Back up by using STSADM Command

STSADM Backup Syntax

For site collection backup

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stsadm -o backup
   -url<URL name>
   -filename<file name>
   [-overwrite]

For catastrophic backup

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stsadm -o backup
   -directory<UNC path or local drive>
   -backupmethod<full or differential>
   [-item]<created path from tree>
   [-percentage]<integer between 1 and 100>
   [-backupthreads]<integer between 1 and 10>
   [-showtree]
   [-quiet]