Restoring the Active Directory
Ø Restore to the Active Directory must be done offline,
booting into Directory Services Restore mode.
Ø If any of the following conditions are not met, the system
state is not restored. Backup attempts to restore the system
state, but does not succeed.
Ø The server name must be identical to the backed up server name.
Ø The drive letter on which the %SystemRoot% folder is located
must be the same as when it was backed up.
Ø  The %SystemRoot% folder must be the same folder as when it
was backed up.
Ø  If Sysvol or other Active Directory databases are located on
another volume, they must exist and have the same drive letters
also. The size of the volume does not matter.