In Business and Ultimate editions, these backups are accessible via the Previous Versions feature. In the two Home editions, the Previous Versions feature is turned off.
So, you don’t want Windows to waste CPU cycles and disk space backing up copies that you can’t get to? Fine. Move your data files to a separate volume, as instructed eariler. You can use a different partition on the same drive or a separate drive – the key is that it have a different drive letter than the volume that holds your Windows and Program Files folders.
By default, Vista enables Shadow Copies (the feature that snaps those backup copies) only on the boot drive. It’s disabled on other drives. (Look below for the way I have my drives partitioned, with the E: drive for all data files and F: for backup images.) So, with data out of System Restore’s way, you have no worries that you’re going to waste space, squander CPU cycles, or compromise your privacy.
The side benefit is you have a cleaner, neater backup solution as well. Do an image-based backup of the C: drive, which you can restore as needed to recover from driver or application problems, and back up your data files in any way that makes sense to you.
Source:→ Ed Bott
Microsoft, Windows Vista, Privacy, Backup, System Restore, Preventing, Copies, Tips