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Recovery Manager for AD Disaster Recovery Edition 10.2.2 - User Guide

Overview Getting started
Permissions required to use Recovery Manager for Active Directory Recovery Manager Console Getting and using help Configuring Windows Firewall Using Computer Collections Cloud Storage Secure Storage Server Hybrid Recovery with On Demand Recovery Managing Recovery Manager for Active Directory configuration Licensing
Backing up data
Permissions required for the Backup operation Managing Backup Agent Using a least-privileged user account to back up data Using Managed Service Accounts Active Directory backups vs Windows System State backups Creating BMR and Active Directory backups Using the Backup Wizard Retrying backup creation Enabling backup encryption Backing up AD LDS (ADAM) Backing up cross-domain group membership Backing up distributed file system (DFS) data Backup scheduling Setting performance options Setting advanced backup options Using Forest Recovery Agent Unpacking backups Using e-mail notification Viewing backup creation results
Restoring data
Getting started with Active Directory recovery Managing deleted or recycled objects Restoring backed up Active Directory components Integration with Change Auditor for Active Directory Using granular online restore Restoring AD LDS (ADAM) Selectively restoring Active Directory object attributes Restoring objects in an application directory partition Restoring object quotas Restoring cross-domain group membership Performing a restore without having administrator privileges Reports about objects and operations Using complete offline restore Offline restore implications Restoring SYSVOL authoritatively Performing a granular restore of SYSVOL Recovering Group Policy Restoring data from third-party backups Using the Extract Wizard Restoring passwords and SID history
Full Replication Consolidating backup registration data Monitoring Recovery Manager for Active Directory Recovering an Active Directory forest
Forest recovery overview Deploying Recovery Manager for Active Directory Forest Edition (Disaster Recovery Edition) Permissions required to use Forest Recovery Console Forest Recovery Console Managing a recovery project Recovery methods Phased recovery Managing Forest Recovery Agent Rebooting domain controllers manually Resetting DSRM Administrator Password Purging Kerberos Tickets Managing the Global Catalog servers Managing FSMO roles Manage DNS Client Settings Configuring Windows Firewall Developing a custom forest recovery plan Backing up domain controllers Assigning a preferred DNS server during recovery Handling DNS servers during recovery Forest recovery approaches Deciding which backups to use Running custom scripts while recovering a forest Overview of steps to recover a forest Viewing forest recovery progress Viewing recovery plan Viewing a report about forest recovery or verify settings operation Handling failed domain controllers Adding a domain controller to a running recovery operation Selectively recovering domains in a forest Recovering SYSVOL Deleting domains during recovery Resuming an interrupted forest recovery Recovering read-only domain controllers (RODCs) Checking forest health Collecting diagnostic data for technical support
Restore Active Directory on Clean OS method Bare metal forest recovery Using Management Shell Creating virtual test environments Appendices
Frequently asked questions Best practices for using Computer Collections Technical characteristics Best practices for creating backups Best practices for creating backups for forest recovery Best practices for recovering a forest Descriptions of recovery or verification steps Ports Used by Recovery Manager for Active Directory Forest Edition (Disaster Recovery Edition) Backup Wizard Online Restore Wizard Online Restore Wizard for AD LDS (ADAM) Group Policy Restore Wizard Repair Wizard Extract Wizard Events generated by Recovery Manager for Active Directory

Best practices for using Computer Collections

This section provides some recommendations for performing granular restore operations with Recovery Manager for Active Directory.

A Computer Collection allows you to group the computers (domain controllers or AD LDS (ADAM) hosts) to which you want to apply the same backup creation settings. For more information on how to create and manage Computer Collections, see the User Guide supplied with this release of Recovery Manager for Active Directory.

It is recommended to add computers to the same Computer Collection if you want to apply the same backup storage policy to all these computers.

For instance, you may want to store domain controller backups in one central location accessible to the Recovery Manager Console over a fast link. This scenario eliminates the need to copy the backups across the network before running an online restore operation and allows you to centrally manage the restore.

Set up the same backup creation schedule for all these computers. When scheduling backups for Computer Collections, it is important to consider that the performance of Recovery Manager for Active Directory may change depending on the number of Computer Collections and DCs in each Computer Collection. For example, the following table outlines the performance for different Computer Collection sizes.


These performance results were gathered from Recovery Manager for Active Directory with the following configuration:

  • Windows Server 2019

  • 4 vCPU, 8 GB RAM

  • Backup schedule configured for every Computer Collection

Table: Performance results for scheduled Computer Collections

RMAD configuration Metrics
Number of Computer Collections Number of DCs in each Computer Collection Console start time (seconds) Time to expand node (seconds) Time to add 1 collection (seconds) Time to remove 1 collection (seconds) Time to rename 1 collection (seconds)
10 10 1-2 <1 0 0 0
10 100 1-2 <1 0 0 0
50 10 2-3 1-2 0 0 0
50 100 2-3 1-2 0 0 0
100 10 4-5 3-4 0 0 0
100 100 4-5 3-4 0 0 0
500 10 21-22 20-21 1 0.5 0
500 100 25-26 23-24 2 0.7 0
1000 10 43-44 41-43 3 1.5 0
1000 100 43-44 42-44 5 2 0

The following diagram provides an example of using Computer Collections:

Figure: Example of Using Computer Collections

In this example, the Recovery Manager Console is installed in the London site. Computer Collections 1, 2, and 3 include all domain controllers from the Tokyo, London, and New York sites, respectively. Computer Collection 4 includes two domain controllers from the London site. Backups of these two domain controllers are accessible to the Recovery Manager Console via a fast link and can be used to perform selective online restores of Active Directory® objects.


Technical characteristics

This section provides some technical characteristics of the product.


Typical backup creation times

The backup creation time depends on the Active Directory database size (NTDS.dit file) and the compression method Backup Agent uses when processing NTDS.dit. You can specify the compression method on the Performance tab in the Computer Collection Properties dialog box. For more information, refer to the User Guide supplied with this release of RMAD.

The following table illustrates the typical backup creation times for different compression methods. This table has been obtained for the following configuration:

  • The NTDS.dit file size: 3.14GB

  • The RMAD computer hardware: CPU 2x Intel® Xeon® 2.8 Hz; RAM 1GB

Compression method Backup file size Backup creation time (min:sec)
None 3.17GB 09:07
Fast 1.27GB 07:35
Normal 1.22GB 08:27
Maximum 1.2GB 17:54



The backup creation times for your Active Directory® database may vary based on size of the database and a number of other factors including the hardware on the domain controller and how densely the Active Directory® database is populated. You can use the examples above as a guide in determining how long it will take to backup your own Active Directory® database, but keep in mind that these times are not directly related to the size of the database (i.e. a 6GB database may not take exactly twice as long to backup as a 3GB database). The best way to determine what to expect for backup times in your own environment is to create a backup of a production domain controller.

Compression ratios can vary depending on how densely populated the Active Directory® database is, but typically using a higher compression method has diminishing returns in terms of the final compressed size of the backup. To ensure both a reasonable backup time and a reasonable compressed backup size it is recommended to use either Fast or Normal compression.


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