Due to the risk involved, The procedure must be done very carefully. It is good first to do some training on non operational domain . To restore Active Directory DB from backup: Determine exactly the object name that needs to be restored (OU name). Reboot domain controller into authoritative restore mode. Restore the system state from last backup. Open a command window Run "ntdsutil" Type "authoritative restore", press Enter To restore a subtree, type "restore subtree" and the entire object Read more