I see. I suppose that makes sense if you mostly work on a single machine. (Since I usually oscillate between two machines I never think about backing up in addition to the normal work-flow.)
Even if you work on several machines, having not to worry about whether they are turned on / are accessible from wherever you are is a huge plus. People tend to have laptops nowadays, which you don't necessarily think about as always on computers.
The older I get, the more precious I find my free time and especially the work I get to put on personal projects. The last thing I want is the risk of that work being wiped out to a very easily avoided mundane issue such as a hard drive failure.
