I'm being asked to recommend an external hard drive with backup software for an old Windows computer that only has USB 1.1. This person is computer illiterate and the solution needs to be super simple (i.e. Apple's Time Machine).

The first question I have is whether USB 2 devices are always backwards compatible with USB 1.1. None of the name brand external hard drives explicitly list 1.1 compatibility.

Second, assuming that USB 2 will work, which external drive bundle includes "one button" backup software that works?