I'm currently using an early 2009 Mac Pro running OS X 10.8.2. Quad-Core Xeon 2.66 GHz, 16GB RAM. Anyway, I'm getting a maxed out 27" iMac to take its place. I was using a WD MyBookWorld II network drive for time machine backups, but apparently upgrading to Mountain Lion broke that capability. So now I'm looking for a Thunderbolt external drive to use with the new iMac. I want to be able to make a backup of my Mac Pro, put it on the thunderbolt drive and then load it on the new iMac. My HD shows 435 GB used. So does anyone have a Thunderbolt drive that would be able to connect to the Mac Pro (USB 2 or Firewire) and would also have Thunderbolt?