
Time Machine works great
Another vote in favour of Time Machine. Plugged in a new drive, OS X asked if I wanted to use it for backup I said 'Yes" by clicking and then I forgot about it.
OS X just runs it all automatically, if the drive isn't plugged in no problem, if you plug the drive in, no problem. It just works and does great backups with the user needing to know anything.
The copy machine in Redmond is just getting poorer and poorer as the years go by.