The following diagram shows the recommended method for storing the backups you plan to use for forest recovery operations:
If you intend to use RMAD to recover the entire Active Directory® forest or specific domains in the forest, it is recommended that you store each backup file on the domain controller being backed up. This will considerably decrease the network utilization during backup operations and speed up the recovery process. On top of that, storing backup files on target domain controllers simplifies the permissions required to access those files.
To recover your Active Directory® forest with the Forest Recovery Console, you can only use backups created with the Recovery Manager Console. In simple environments, it is advisable to have only one Recovery Manager Console deployed. However, this may not be possible in large distributed environments that spread across different physical locations connected by slow links. In this case, you can deploy several instances of the Recovery Manager Console in each main physical location to back up domain controllers there.
You can also deploy several instances of the Recovery Manager Console if you want to:
Delegate the right to back up individual Active Directory® objects and perform online restores to other administrators in your environment, without delegating the right to run forest recovery operations.
Back up and restore individual Active Directory® objects using backup and restore strategy and schedule specific to those objects.
This depends on the forest recovery approach you choose for your environment. For more information, see Forest recovery approaches.
The decision on how many domain controllers to back up (and, therefore, which method to use for forest recovery) depends on the factors like
The overall number of domain controllers in Active Directory®
The size of Active Directory® database
With a large number (50+) of domain controllers in the domain and significant size (over 1 GB) of the Active Directory® database, it may not be feasible to fully back up Active Directory® of all domain controllers in the domain due to storage limitations or time constraints. In this case, you can back up only some of the domain controllers.
A good practice is to back up at least two domain controllers from each domain in the forest. It is recommended to back up the domain controllers that are DNS servers and FSMO role holders.
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