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.
The Recovery Manager Console allows you to group the computers you want to back up into computer collections with each collection having its own backup creation parameters and schedule.
All computers in a computer collection are backed up simultaneously. The backup creation process may be a resource-consuming task if the number of computers in a collection is more than 10. Therefore, it is recommended that you back up only one computer collection at a time. Also, it is not recommended to have more than 10 domain controllers in a single computer collection.
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