I have had a Macbook Pro for about a year now and I have fallen in love with the Mac. I take LOTS of photos and I use my Mac now all the time over my PC. I want to store all my photos on a USB or Firewire hard drive because it has gotten to the point I am filling up my hard drive. I also need to start using Time Machine. If I have my Iphoto Data stored on a USB drive (DriveA) and I have a 2nd Drive (DriveB) dedicated to Time Machine. Will Time Machine backup my Iphoto data that is stored on DriveA or will it only backup the internal Hard drive?