Here's my situation: I used a Time Machine drive connect to an AEBS for a while. When I moved/upgraded to ML I also added a MBP to the set up (before it was just my imac). So, I partitioned the 1TB drive into 2 halves, one for each machine. Since the move/upgrade to ML, I've had all sorts of issues with the drive not showing up in Finder/Time Machine not starting. So, I connected the USB 1TB drive to my iMac and backed up to it. That won't be an issue. My question is, is there a way to back up to the drive now from my MBP, now that it's USB connected to my iMac?