I am running full backups of our DC's, but most of them fail because of certain databases like wins, dhcp, .net, etc. that cannot be backed up. We have the open file agent, but it doesn't seem to help much. I also run system state backups every night which I believe contains the registry and other critical system data. Is it necessary to backup the windows folder if you do a system state backup, or am I just wasting time and tape space? ;-)