An excellent component - I've ensured it's on all of my websites. I run bi-weekly updates which get picked up by FTP to both my fileserver and thumb drive. Geoffrey has done a great job, picking up where Nicholas left off. It's irritating to see negative comments rather than something constructive that might help the author address any issues. I had a few issues that were resolved by tweaking settings and have ended up with different versions running on different servers with different settings.
The one feature I'd like to see? The ability to do automated backups (by cron job or other means) set from within the component config.
As far as free backup utilities for Joomla go it's one of the best. Good work!