System Restore also been featured in Windows Vista, just like in Windows XP. However, unlike the user friendly and easy to use slider bar in Windows XP, there is no easy way and no longer an ability to change the limit of System Restore disk storage space usage in Windows Vista via graphical user interface.
In order to limit the maximum hard disk space can be used by System Storage or change the limit of this value, Windows Vista offers a command line utility called Volume Shadow Copy Administrative Command-Line Tool, or vssadmin.exe. The utility is named Volume Shadow Copy Service (VSS) because it includes not only System Restore function, but has added several enlarged functions such as Previous Versions feature that backup copies of deleted or changed files, and the service is also been used by the built-in Vista backup tools.
Microsoft, Windows Vista, System Restore, Storage Space, Usage Size, VSSAdmin, Knowledgebase