If you change things so that you don't have a password protected screen saver, and set the schedule to run a few minutes from 'now', does it work while you're watching?

Just tested and no, it does not. Even if the computer is just sitting idle with the screen unlocked it will not run scheduled. If I simply tell it to back up it works.

OK. Let's move to support email and we'll try some additional diagnostics.

Just sent my email in to support. Thanks.

Just to let everyone know, the resolution to my issue was to put SD! on the start up volume. Everything seems to be working now. Thanks!