NWA-PCUG Newsletter Article, May 2010
Controlling System Restore
By Vinny La Bash, Member and Regular Columnist,
Sarasota Personal Computer Users Group, Inc., Florida

http://www.spcug.org
vlabash (at) comcast.net (click to email author)

This article has been obtained from APCUG with the authorís permission for publication by APCUG member groups; all other uses require the permission of the author (see e-mail address above).

Did a shareware application you were enamored of turn out to be an unmitigated disaster? Perhaps a device driver installation, system update or modification to a registry key went bad, and your system wandered into an alternate universe. Windows has a utility called System Restore that takes a picture, called a Restore Point, of your system before certain types of operations are started. System Restore is a very handy feature that allows you to go back in time to erase actions you have come to regret. If a problem occurs you can revert back to the way things were, and all is well again.

System Restore, for all its utility and convenience, has its drawbacks. Some argue that if there is not enough free disk space, System Restore will fail to create a restore point, so an unsuspecting person may discover that there is no restore point available when trying to put things back to normal. There is also no way to make a permanent restore point that will not get deleted after a time when automatic restore points need the disk space. This could be a predicament if a problem is intermittent.

It is possible that System Restore may be responsible for your disk drive running out of room. While todayís super-sized drives make that less likely than a few years ago running out of disk space could still happen, especially if you load up your system with videos. You can reduce that likelihood even further by configuring System Restore properly.

The snapshots we talked about in the first paragraph are taken by a built-in program called the Volume Snapshot Service (VSS). There is no way to access this utility in the standard Windows Graphical Utility Interface (GUI). This means you canít get to it with a menu option. You need to open a Command Prompt window with elevated administrator privileges.

Click on the Start orb located down at the bottom left corner of your screen, select All Programs, and open the Accessories folder. Right click on the Command Prompt icon, and then select Run as Administrator from the menu. That will open up a Command Prompt window with enough authority to configure System Restore.

Before doing any configuration, letís take some time to understand how System Restore works. You can do this with the vssadmin tool. At the Command Prompt type vssadmin /? (Press Enter after typing a command.)

You see a list of all the commands supported by the utility.

(Note: Shadow copy = Restore Point)

Enter the command vssadmin list shadows

This displays a list of all the restore points currently on the system.

The list shadowstorage command displays the amount of disk drive space currently being used to store restore points, how much space is set aside to accommodate restore points, and the maximum permitted size for restore points.

To see whatís available on your own system, at the Command Prompt type:

Vssadmin list shadowstorage

Take a few minutes to understand the way the information is displayed. If there is enough free disk space you can store up to 64 restore points before Windows automatically starts deleting old restore points to accommodate new ones.

Making backups is an essential task, but there is no reason why Windows should be allowed to consume every available byte of storage with System Restore points. The default settings allow Windows to run amok but you can reset the maximum value with the resize shadowstorage command.

Here is an example:

Vssadmin resize shadowstorage /for=c: /on=c: /maxsize = 12GB

The /for= switch specifies the disk drive where the storage space is to be resized.

The /on= switch tells Windows where to save the Restore Point.

The /maxsize= switch tells Windows how much space it can use for Restore Points.

If you donít specify a maximum size you are giving Windows permission to do anything it wants. The minimum size is 1GB. I have seen references stating that the minimum size can be as low as 300MB, but I could not verify that information.

After entering the resize command the system needs to be restarted to take effect. Configuring System Restore points wonít solve every problem you may have with Windows, but it will give you more control of how Windows allocates resources.

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