I'm thinking of switching to a 13" Macbook Air. The problem is, I am a photographer, and therefore have a massive photo/video library. Currently my Macbook Pro has a 750GB HDD AND a 120GB SSD both inside (I took out my optical drive), so it's not an issue. So if this were to work, I'd need to keep them on an external hard drive. However will Time Machine backup my external hard drive as well? Or does anyone have any other suggestions for how to make a setup like this work? Thank you very much!!!