Backing Up and Restoring Web Sites (Windows SharePoint Services 2.0)

stsadm.exe is at C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN.

Find the list of sites:

stsadm.exe -o enumsites -url 
To perform a simple backup of a site, you would use syntax similar to the following:

stsadm.exe -o backup -url http://server_name/site -filename backup.dat

To restore a site from a backup file, either to a new site or a separate server,
you would use syntax similar to the following:
stsadm.exe -o restore -url http://server_name/site -filename backup.dat

See also: http://technet.microsoft.com/en-us/library/cc288330%28office.12%29.aspx