Hello guys, new member and first time post. I bought my base 27" imac last summer in time for college and been having a fun time with it. Yet I've just now gotten to actually backing up the computer. Yeah shame on me , and I would just like to know what would be the best way since I have two hard drives. A 640gb seagate that was format ntsf for the previous windows computer (now installed ubuntu) my family had before buying the imac. Since I couldn't use it for time machine I bought the 2tb WD My Book for Mac and now just realized I could've format the seagate one. Mac Extended Journal seemed to be the de facto choice according to the responses I found on the internet. I was wondering should I format the 2tb one to fat32 as a link between the linux and mac or partition it (and what is partition? I only get the gist of dividing up distinct space on a hdd but the concept is still vague to me). And once I've gotten the external hd set up, should I use ccc or tm on separate hard drive or both on the mac os journaled one? Phew, man sorry for the laundry question lists, I'm pretty new to mac and only have a limited googler computer knowledge. Thanks for your help.