What's the best free file system backup utility?

Are you looking for fully bootable images or more of a weekly file backup type of thing?

i really liked acronis trueimage. it s not free though.
comodo offers a free backup program, but i don’t know the features.

here it is

The OS includes one.

You might want to look at PureSync, which is free for personal use.

I would look at something like Fab’s Autobackup if you are looking for a real quick and easy backup program, or SyncBack Freeware if you are looking for more the ‘set-it-and-forget-it’ kind of backup.