Here's an interesting question:  why would you want to backup a DC,
especially where you have a DC (W2K) or two in every remote site of the WAN?
Why/what would you ever restore that you wouldn't get from the other domain
controllers if one or even a few are down?

I ask this because my theory is "when in doubt, backup it up".  At a couple
hundred dollars a license it seems a reasonable assurance policy (depending
on the budget, of course).  Another theory applies here as well, "backup
everything, exclude only as needed, even if that client options set gets
pretty big".

____________________________________________
Jon R. Adams
IT IPS BST Infrastructure
Premera Blue Cross
Mountlake Terrace, WA
425-670-5770
jon.adams AT premera DOT com