Vista, Change the amount of space used by System Restore | Windows Vista™

System Restore is a very useful feature of Windows Vista but it has one main drawback. After running for a few weeks, it can use a lot of your hard disk space. With the default settings turned on, System Restore might use up to 15 percent of the space on each disk. For example, if you have a 250GB hard disk drive, System Restore might end up using 37,5GB of it. That is a lot of space.
What can we do to limit the amount of space used by System Restore? In Windows XP making this kind of configuration was pretty easy. You had a slider in the System Properties window that you could move left or right to the desired percentage. Unfortunately this slider was removed from Windows Vista.
In order to configure the amount of space used by System Restore, you need to use a tool called Volume Shadow Copy Administrative Command-Line Tool (or vssadmin.exe).
For example, if you want System Restore to use a maximum of 1GB of space for the restore points on drive "C:", you should type the following:

vssadmin resize shadowstorage /On=C: /For=C: /Maxsize=1GB