It seems to me that you have as well thought out a system as almost anyone I know. I actually gave up on using a UPS several years ago, and my backups are now just the things most important to me..... my GEDCOM files, my music/video files and my copies of my program installation files..(portable/zip whenever possible). I have several large capacity portable HDS and several good USB thumb drives.

It never dawned on me that one COULD connect a UPS with an external drive, but these days almost anything you can think of has been implemented.

The ONLY thing I'd even offer to someone that careful is a list of incremental backup programs. I use Cobian Backup myself, but it is no longer under development, and I have seen others suggested in the alt.comp.freeware newsgroup.