Backup your WSUS database

"c:\Program Files\Microsoft SQL Server\90\Tools\binn\SQLCMD.EXE" -E -S np:\\.\pipe\MSSQL$MICROSOFT##SSEE\sql\query -Q "BACKUP DATABASE [SUSDB] TO DISK = N'C:\backups\SUSDB.BAK' WITH NOFORMAT, INIT, NAME = N'WSUS Database Backup', SKIP,NOREWIND, NOUNLOAD, STATS = 10"

c:\backups must be writable by the user that is running the database. In my case, I believe this is user "NETWORK SERVICE".