AUto backing up means, when you forget to back up your files (rigorously), you don't have to pay the ultimate price for being human. My mother (bless her heart) lost 12 hours of work because she overwrote an older file attempting to do just this (manual-sequential backups).
This is certainly a huge oversight by the iWeb development team. Of course, alongs comes an inexpensive back-up utility like this.
I'd like to see a review of the product, rather than this sort of obvious (and inevitable) criticism.
A personal thanks goes out to the developer for plying his wares on the Mac. Welcome, and best wishes.