Backup and Restore SharePoint Site

Site Collection Backup and Restore

Backup: 
stsadm -o backup -url http://site1.com/sitecoll1 -filename c:\backup\backup1.dat
Restore: 
stsadm -o restore -url http://site2.com/sitecoll1 -filename c:\backup\backup1.dat -overwrite

Export and import a subsite, list, or library

Export:

stsadm -o export –url http://site1.com/sites/portal/Shared%20documents –filename c:\backup\lib.bak -quiet -overwrite 

Import:

stsadm -o import –url http://site2.com/sites/portal/Shared%20documents –filename c:\backup\lib.bak -quiet