I have had my 1TB for two years now and I am needing more storage on it, I really do not want to buy another one although a 3TB would be lovely. I have read you can plug in a USB HD into the TC. This sound simple enough, but what is the strict procedure and how does the Time Machine carry on after you have done this. Am I to wipe the TC clean, how does the new available space integrate into the TC? thanking you for any help as I am not too confident with anything out the ordinary.