Heya! Well i noticed the time machine and it looks pretty good for back ups. Now i have a 160GB external USB drive that i use for movies, media, photography work etc. Now can i still select this hard drive as a back up. I've been told the back up will be 38GB. Which is fine. Question is, where does it store the backup on the hard drive? Can i use the hard drive for my media or does it wipe it and use it for a 'Time machine'/back up drive only? Advice and guidance on this is greatly appreciated. Thanks!