I have restored an SBS 2008 server to a new box using Microsoft's own SBS 2008 backup, and running a bare metal restore.
The restored PC does not have a functioning Active Directory (for example AD Users and Computers does not work.)
The problem would appear to be DNS related. The following error occurs in the DNS log shortly after booting:
The DNS server was unable to open zone fx.local in the Active Directory. This DNS server is configured to obtain and use information from the directory for this zone and is unable to load the zone without it. Check that the Active Directory is functioning properly and reload the zone. The event data is the error code.
Any ideas, or do you need more information?