I have a late 2008 15 inch MacBook Pro with a 320 GB hard drive inside, and a 500 GB Western Digital MyBook external USB drive. The external is partitioned so that there's a 200 GB partition for storage, and 300 GB for Time Machine. It all worked fine but now I'm running very low on space, as I'm a photography student and I have loads of gigantic Photoshop files and tens of thousands of high resolution photos, many of which are RAW. That is to say, I cannot delete any of that, it's more important than anything. Now the way I do things is I keep almost everything on the internal drive, and let Time Machine back it up, so that I have a backup of everything I don't want to loose. The 200 GB partition on the external is for storing videos and stuff that I don't care much about. Now the thing is I could buy a 2 TB external drive, but I would still have to move much of my stuff from the internal to the new external, and I would therefore not have 2 copies of that data. I don't want 2 externals backing up each other either, as I travel a lot and they won't fit in my suitcase (not to mention I can't afford that), and my MacBook Pro doesn't even have enough USB ports for that (the 2 ports are already constantly in use). I don't have much money so I can either buy something like a 2 TB external and that's it, or maybe a 1 TB internal and a 1 TB external. I've thought about replacing the optical drive with a hard drive, but then I would need to buy an external optical drive which I can't afford both in money and in physical space. I barely ever use my optical drive but I do need it 2-3 times a year. My question is: what do other people do to have enough space while still being able to back everything up at least once? What do you recommend?