A nonauthoritative restore of Active Directory is usually done when the Active Directory database is corrupt or when you're doing a full server recovery.

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Quizplus · Accepted Answer

A nonauthoritative restore of Active Directory is typically performed to fix database corruption or to restore a domain controller during disaster recovery. During a nonauthoritative restore, only the database is restored from a backup, and then it is updated with the most current data from the other domain controllers in the domain. This type of restore does not affect the Active Directory data on the other domain controllers.

A Nonauthoritative Restore of Active Directory Is Usually Done When