Up until now I have only used thumbdrives for backing up important files. Currently I have a 2009 24" iMac that served me well but is getting old, so I will be getting a new iMac when they come out. The entire 640GB hard drive only has 51GB of data including programs, files, music, and pictures. As you can see, I don't use much data. I would like to start backing up this machine, I believe that Time Machine would be a good choice for me because it seems pretty seamless and I like the way it will put everything back together just the way I had it if something ever goes wrong (kinda like iTunes does with the iPhone or iPad). So basically, all I need is a 100GB or larger external USB hard drive? That's it, just turn on Time Machine and let it do it's business? Then when I get my new iMac I can just plug it in and let Time Machine restore it with all the old data and settings as the old iMac? My other question is what about using a cloud based backup? Since I only have 50 gigs of data and I have a very fast FIOS 50/25mbps connection, it seems like offsite backup would work. But I am sure there are downfalls to that too.