From Windows Help:
How are Previous Versions created
Previous versions are automatically saved as part of a restore point. If system protection is turned on, Windows automatically creates previous versions of files and folders that have been modified since the last restore point was made. Typically, restore points are made once a day. If your disk is partitioned or if you have more than one hard disk on your computer, you need to turn on system protection for the other partitions or disks. Previous versions are also created by Windows Backup when you back up your files.
Notes: Revo Uninstaller will not remove the Previous Version folders. They don't want to remove the current folders, they want to remove the previous ones; these aren't stored anywhere "near" (filesystem wise) the actual folder; they are stored as part of system restore points in System Volume Information.
Because restoring previous versions is really part of system restore (you restore previous versions of the select files, but they all exist in system restore points) you cannot really selectively delete only the previous versions of a single folder.
You can remove ALL previous versions of all Folders by doing this:
- Click start
- Right-click computer
- Click properties
- Click System Protection in the left pane
- Uncheck the drive you want to remove previous versions for
Note that this will of course remove all restore points as well.
To make this easier, you can use the built-in Windows Disk Cleanup utility:
- Start Disk Cleanup
- Choose the "More Options" Tab (you may need to choose the "Cleanup System Files" button on the first tab to run disk cleanup as an admin for this to work properly
- In this tab, there is a frame titled "System Restore and Shadow copies" There, choose the "Clean up" button. This will (after confirming a "do you want to continue" prompt) delete all but the most recent restore point.
Note that if you delete all but the last restore point, there will still be a single previous version of said folder. However, if you were to delete the folder, and then create a NEW restore point, and then delete all but the most previous (the one just created) there will no longer be previous versions for that folder that contain files from before that restore point.
Another benefit to this is that you get a lot of disk space back. I recovered over 100GB by following these steps myself (to make sure that previous versions for certain folders I was checking were in fact gone). Which is rather nifty.