Even if you might be tempted recovering your failed domain controller(s) using one of this methods can have catastrophic results on the consistency of the directory as a whole like SID rollback, lingering objects and USN rollback. Backing up virtual disks (for VMs) or using disk image software like Norton Ghost are specifically not supported for domain controller backups. Even if you have good backups somewhere on the shelf that’s only 50% of the job done, because as you’ll see later in the article, the way you recover a domain controller is way different from recovering file servers or application servers. This can happen due to a hard disk crash, a bad network card, file system corruption or corruption of the Active Directory database. Just when you think everything is going well, disaster happens, and one or more of your domain controllers gets offline.
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