I have been searching for an answer for this question, and I am sure it has been answered before, so I am sorry guys that I am asking this again. I have a 500gb lacie d2 quadra that I plan to partition 4 times (1 for time machine, 1 for carbon copy cloner, 1 for my music and and 1 for my movies - the last two partitions in the FAT32). I need to delegate 120gb for my ccc but I am not sure how much I should give time machine as I want to give more harddrive space to my media partitions. I just want time machine to use it in the basic sense, and to have it available should my harddisk fail at any point. I have a lot of programs that I cannot afford to lose. What do you guys think? Any advice would be appreciated! GOOGLED: It seems most people suggest a external drive with twice the size of your laptop harddrive. If this is wrong let me know!