The backup article on Anandtech got me thinking about doing full system backups. I already use crashplan to backup documents and pictures offsite. But I have an external USB drive that I could do system backups to. That way I could do a full restore if my HD dies one day. The Win7 system backup does incremental backups, which is fine. But, how does it determine when to do a new full backup and start over, or does it just do incremental backups until it fills up your backup storage? Are their any free system level backups that are better than windows backup for Windows 7.