I wondered if anyone knows a work around for an issue im having. I currently have a MacBook PRO and a Toshiba 500Gb external HD. Instead of backing up my iTunes library etc.. using time machine, id rather just copy it over whenever I use the HD. But if I do this I have to 'replace' the entire library instead of it just skipping any duplicate files. This obviously takes forever and a day to do, so is there a way to make the transfer quicker by it doing a similar thing to Windows and checking for any duplicate files first so it only adds the new files???