Taking advice from a thread on this subject at LL, I downloaded CCC and got an 8TB external hard drive set up. My main computer is a Mac Mini with a 1TB conventional drive as well as a 250GB SSD. My LR photos are stored on a separate external HD.
I set up CCC so it back up the 3 drives (2 from the Mac Mini and my external HD containing my LR photos). When I click on the drive the CCC is backing up to, it just contains all of the files in total, not separated according to the drives they originated from.
Should I partition the back up drive into 3 different partitions and specify each donating drive go to a separate partition to keep thinks more organized?