Windows Server 2012 Active Directory Certificate Services System State Backup and Restore

First published on TECHNET on Mar 21, 2013

2012 System State Backup allows an administrator to back-up several Operating System components including those required for a successful restore of a Certification Authority. Any certification authority backup should include the private key, certificate database, logs and the certification authority's registry configuration.

Backup Feature should be installed on the certification authority to take a System State Backup. It has been enhanced in 2012 to allow the administrator to take a System State Backup using the feature's Graphical User Interface (GUI), and the command line. Furthermore, System State Backup in Windows Server 2012 allows the administrator to back-up the certification authority's Private Key without the need to install any hotfixes.

Note: Windows Server 2008 and 2008 R2 required installing a hotfix to back-up the private key using System State Backup

Steps Required to Back-up the Certification Authority Using System State Backup

There are two easy steps to prepare the certification authority for a System State Backup.

1. Install Windows Server Backup Feature

2. Schedule a System State Backup

Install Windows Server Backup Feature

Windows Server Backup is not enabled by default on Windows Server 2012. The feature needs to be installed before taking or scheduling a System State Backup.

1. Log on to the certification authority and select Manage in Server Manager

2. Click Add Roles and Features

3. Click Next in Before you begin screen

4. Select Role-based or feature-based installation and then click Next

5. Select the local server in Select destination server screen

6. Click Next in Select server roles screen

7. Select Windows Server Backup in Select features screen and then click Next

8. Select Install in Confirm installation selections screen

9. Click Close

Note: The Winddows Server Backup feature can be installed using Install-WidnowsFeature –name Windows-Server-Backup cmdlet

Schedule a System State Backup

Windows Server Backup allows administrators to back-up the system to a non-critical volume only, setting a registry key as described in KB944530 provides a workaround to this limitation, but it is not recommended to run in production because it might cause a critical volume to fill up quickly. In general, make sure you have a volume, or disk or share designated to a certification authority's backup other than your c: drive.

Using the Graphical User Interface (GUI)

1.   Log on the certification authority and select Tools in Server Manager

2. Click Windows Server Backup

3. Select Local Backup

4. Click Backup Sched

5. Click Next in Getting Started screen

6. Click Custom – I want to choose custom volumes, file for backup and then click Next

7. Click Add Items in Select Items for Backup screen

8. Select System State and then click OK

9. Click Next in Select Items for Backup screen

10. Choose the backup run time frequency in Specify Backup Time and then click Next

11. Select the backup destination in Specify Destination and then click Next

Note: The rest of this document assumes having a dedicated volume to back-up the certification authority to. The wording might be slightly different is you chose a share for your backup location.

12. Click Add in Select Destination, select the dedicated volume and then select OK

13. Click Next

14. Review the scheduled backup settings in the Confirmation screen and then click Finish

Using the Command Line

Windows Server Backup can be configured using the command line. The command line tool Wbadmin has many verbs that can identify backups, volumes, disks, create jobs and many more. The disk identifier has to be known before scheduling any backup job.

The disk identifier is retrieved by running Wbadmin get disks

Note the Volumes label in the screen shot. The scheduled backup should target non-System Reserved volumes. The volume that has the Disk Identifier {eb9c44d8-0000-0000-0000-000000000000} is the clear choice for the backup files.

The next step is creating a scheduled task to take a System State Backup to the volume specified. This is also achieved using the Wbadmin command line tool with the enable backup verb. For example, run the following command to set up a backup job to run daily at 10:00 PM and include System State Backup

Wbadmin enable backup –addtargret: {eb9c44d8-0000-0000-0000-000000000000} –schedule:22:00 –SystemState

Note: If you prefer to take a one time System State Backup, then run Wbadmin Start SystemStateBackup –backuptarget:< non-critical volume DriveLetter>

Using PowerShell

Setting a schedule System State Backup might seem intimidating at first. The tasks involve creating a backup policy, a backup directory, a schedule, and then trying all of that to the policy. Let us go through them one at a time

The first command stores the result of the New-WBPolicy cmdlet in the variable named $Policy

  PS C:> $Policy = New-WBPolicySetting the volume as the System State Backup Path

This command creates a WBBackupTarget object that uses a volume with drive letter E: as the backup location. You can add multiple volumes for to the WBPolicy object that contains the backup policy.

 PS C:> $volumeBackupLocation = New-WBBackupTarget -VolumePath E:

This command adds the system state to the backup policy in the $Policy variable.
 PS c:> Add-WBSystemState -Policy $Policy 
 This command adds the backup location – volume E - to the backup policy in the $Policy variable
 PS C:> Add-WBBackupTarget -Policy $Policy -Target $volumeBackupLocation

This command sets the backup schedule configured in the $Policy variable to run daily at 10 PM

 PS C:> Set-WBSchedule -Policy $Policy –Schedule 22:00:00

This is the last command, where it sets the backup schedule based on the $Policy variable

 PS C:> Set-wbpolicy –policy $Policy

Steps Required to Restore the Certification Authority from System State Backup

The steps listed in this section detail three different approaches to restore the certification authority using Windows Server Backup Graphical User Interface (GUI), Windows Server Backup Command Line, and Windows Server Backup PowerShell.

General Steps Required to Restore the Certification Authority

The general steps to restore the certification authority are the preliminary steps required before attempting any other restore activity. These steps are:

1. Install Windows Server 2012 Standard or Datacenter Edition depending on the certification authority's previously installed operating system version.

2. Join the server to the same domain or workgroup

3. Access to System State backup media

4. Install Windows Server Backup Feature

Restore the Certification Authority Using Windows Server Backup GUI

1. Select Tools in Server Manager

2. Select Windows Server Backup

3. Select Local Backup

4. In Actions menu, select Recover

5. In Getting Started window Select This Server ( local Servername) and then select Next

5. In Select Backup Date window , choose the backup to restore from and then click Next

6. In Select Type window, select System State and then then click Next

7. In Select Location for System State window, select Original Location and then click Next

8. Review your selections in the Confirmation window, make sure Automatically reboot the server to complete the process is selected and then click Recover

9. Click Yes in the screen warning you about the ability to cancel, or pause System State backup once the recovery operation is started

10. At this point, System State recovery will restore the certification authority, and automatically reboot the server

11. Press Enter to continue after you log on the server after it reboots to confirm System State recovery

Restore the Certification Authority Using Windows Server Backup Command Line

1. Start the Command Prompt (Admin)

2. List the backup history by running wbadmin get versions and note the version identifier of the latest backup. The backup's Can recover value should clearly indicate System State is included in the backup.

3. Start System State recovery by typing wbadmin start Systemstaterecvoery –version: -backuptarget:

For example, the version identifier from my latest backup is 03/14/2013-04:03 and stored on C: , hence the command is wbadmin start systemstaterecovery –version:03/14/2013-04:03 –backuptarget:c:

4. Type Y and the then hit Enter to start System State recovery

5. Type Y and then hit Enter to confirm. System State recovery will start restoring files

6. Type Y and then hit Enter to restart the system to complete the System State restore

Restore the Certification Authority Using Windows Server Backup PowerShell Cmdlets

1. Start PowerShell as an Administrator

2. Set the $Backup variable using Get-WBBackupset cmdlet

PS C: $Backup = Get-Wbbackupset

3. Start the system state recovery from the backup set in $Backup .

PS C: Start-WbSystemStateRecovery –backupset $Backup

4. Type Y when prompted to restore System State to the original location

5. Type Y to confirm the required system restart

Amer F. Kamal

Sr. Premier Field Engineer


This article was originally published by Microsoft's Core Infrastructure and Security Blog. You can find the original article here.