I betcha 99% of people who wouldn't have thought of doing a backup would've ignored any warning/alert to do a backup. They like to click "Next", "Next", ..., "Finish". sjgadsby's post mostly explains why Maemo's Backup works the way it does. It's more of a "dynamic" backup and has advantages/disadvantages compared to the ghost-like backup that nandroid does. Advantages include being able to upgrade/downgrade and still restore your installed apps and settings. You should be able to do this when Backup Menu V2 is ready.
wait, I thought I saw that when I was updating OTA...