I might have asked this some time ago, but can't find anything now. I have been doing a lot of rearranging and deleting a lot of various file off my hard drive. I leave the WD backup disconnected most of the time, because it has to sit on top of the tower. When I do hook it up again, will it delete and/or add all the changes I have made just like my HD does. Or if I decide to just start over, can I delete all the stuff I have on the WD drive and let it backup my HD when I get it all the old and obsolete files cleaned up. Thanks again for your help.