I just recently bought a LaCie 7200 rpm 3tb hd with thunderbolt to use with time machine. I was going back and forth with whether or not to get the time capsule or not. I eventually decided not to because 1) the less equipment I have co-mingled, the less likely of major failure. I.E. If the router breaks, I'm not also down the TM or vice versa. 2) the speed of the back up should be faster through thunderbolt vs. ethernet which may be bogged down with internet activity since it's all passing through the same ethernet cable. 3) I don't believe the TC hd is 7200 rpm. I did my first back up last night and it went smoothly. I actually have it to not automatically back up as I don't necessaily want it to back up every hour. I only want it to back up when I need it so I'm sticking with manually backing it up which basically occurs whenever I load new photos to the computer. So when I got home from work yesterday, I set it up planning to let it run overnight as many people suggest you do for the first back up since it's backing everything up. When I set it to run at about 4:05pm, it said that it had 281gb of information to back up. I expected this to take a while but it was finished in a little over an hour. Wow! Thunderbolt and 7200rpm are fast! I'm so glad I went this route. Hopefully, this will last me a while.