If you have taken or deleted many snapshots, you need to defrag snapshots to reclaim free disk space and improve system performance.
 
1. Right click RollBack Rx icon in the system tray, select "Open Rollback Rx" from the popup menu. You will need a user name and password to logon RollBack Rx Application Console if the access control is enabled.
 
2. In the Application Console, under Advanced Tasks, click on "Snapshot defragmenter". Click on "Defragment" to start defrag. It might take some time to defrag all snapshots (depends on how many snapshots you have and when it was defragged last time).

For best system performance it's important to defrag snapshots and defrag them often.