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There are three infrastructure VMs (for Active Directory, DNS, and DHCP) in the management cluster. All of them are backed up locally by using Windows Server Backup.

If one or more of the Active Directory/DNS/DHCP instances fails because of corruption or deletion of critical directories, you can use bare metal recovery to recover the instance. The procedure for using bare metal recovery to recover a single instance is described in this section. If there are multiple instance failures, you must repeat this procedure sequentially for all failed instances.

1. From the VMM console, connect to the failed domain controller VM. Boot the Active Directory/DNS/DHCP server into Windows Recovery Environment (WinRE). The server automatically boots into WinRE if it fails to boot into normal mode twice. If the server boots normally, run the following commands at a command prompt to restart in WinRE mode:
reagent /boottore shutdown /r /t 0

2. In WinRE mode, click Troubleshoot.

3. On the Advanced Options screen, click System Image Recovery.

4. Select the Administrator account on the System Image Recovery screen.

5. Type the password on the next screen.

6. In the Re-image Your Computer Wizard, you can see the latest available system image for recovery. If you want to recover to an older point in time, click Select A System Image, and choose the desired point in time. Click Next.

7. Click Next on the Choose Additional Restore Options page.

8. Click Finish to complete the Re-image Your Computer Wizard. The following screens display the progress of the recovery as all volumes are restored.

9. In the dialog box that is displayed, click Restart to restart the computer.

10. After recovery completes, schedule full server backups by using the Windows Server Backup
tool, as described in Configure Automatic Backups to a Volume at http://technet.microsoft.com//library/dd851674.aspx. You can do this as follows:
a. On the Select Backup Configuration page, click Full Server (recommended).
b. On the Specify Backup Time page, click Once A Day, and then select 12:00 AM as the backup time.
c. On the Specify Destination Type page, click Back Up To A Volume.
d. On the Select Destination Volume page, select Local Disk (F:) as the destination volume.

Source of Information : Microsoft System Center