Yes, but you want to ensure that Time Machine is not backing up the ShredIt X temporary file when you are wiping free space. Configure Time Machine to "not" backup the ShredIt X Freespace folder. (You only need to do this once, not every time you shred freespace.) Follow these instructions: - Run ShredIt X and start wiping free space. (You have to create the temporary file so you can exclude it from Time Machine.) - Open the System Preferences and Select "Time Machine". - Click the Options button. - Add the ShredIt X Freespace folder to the Time Machine "Do not back up" list On the Time Machine "Do not back up" Dialog, and Click "+" - Using the window, find the folder HardDrive>ShredIt X FreeSpace - Select it using the "Exclude" button