But did I panic? I did not. I went to http://carbonite.com, logged in, and in two or three seconds I learned how to restore a single file from my Carbonite backup disk. A minute or two later, I had restored last night's backup of the to-do database and I was back in business. I can't really see how it could have been much easier.
I've been using Carbonite for a while. It's cheap ($50 a year) and easy. It has some limitations, of course. It won't backup data on external drives, like the large external drive that I use to store photographs. So I have to use a more complicated system to back up photos. But for the stuff on my computer's internal drive, Carbonite can't be beat.