When restored non-authoritatively, settings and entries that existed in the domain, schema, configuration, and optionally the global catalog naming contexts maintain the version number they had at the time of backup. After the restored domain controller is restarted, the Active Directory replication updates the domain controller with the changes that were made to Active Directory since the backup time.
When restored non-authoritatively, the local copy of the SYSVOL that is held on the restored domain controller is updated with that of its replication partners. After the restored domain controller is restarted, it contacts its replication partners, compares SYSVOL information, and replicates the necessary changes, bringing its local copy of the SYSVOL up to date with the other domain controllers within the domain.
If the domain controller being recovered is the only functioning domain controller in the domain, a primary restore of the SYSVOL should be done. A primary restore builds a new replication service database by loading the data present under the SYSVOL onto the local domain controller. This method is the same as nonauthoritative except that the restored data is marked as the primary data.
Perform a primary restore only when all domain controllers in the domain are lost and you want to rebuild the domain from backup. Do not perform a primary restore if any other working domain controller in this domain is available. Use primary restore for the first domain controller, and then, later, use non-authoritative restore for all other domain controllers.
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With the Repair Wizard, you can perform an authoritative restore of Active Directory. The wizard allows you to mark the entire Active Directory database, a single subtree, or an individual object as authoritatively restored.
To mark AD objects, subtree, or the entire AD database as authoritative, Recovery Manager for Active Directory uses the capabilities provided by the Ntdsutil.exe tool supplied with Microsoft Windows. However, this tool included in Windows Server 2008 or higher does not support marking the entire AD database as authoritative.
As a result, the wizard increments the version number of the attributes of all objects in the entire directory, all objects in the subtree, or the particular object to make it authoritative for the directory.
An authoritative restore can only be carried out on objects from the configuration and domain naming contexts. Authoritative restore of the schema-naming context is not supported.
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