So I am sending my Air to Apple for a warranty, and of course I need to wipe the HD prior to sending it. Now how do I do a time machine backup and restore (when I get it back) of my air to have a correct copy of the previous mac without hints that his was a previous install. The reason why I am asking this is I've done TM restores before, and they would duplicate the files. Like there would be an "old mac" folder where all the old applications are. I also don't want to have itunes lose my settings and all that, so if anyone can help me please let me know.