Free backup software for Windows servers

is there such a thing? I just want to do some disk to disk backups of some Windows 2000 and 2003 servers I have that aren’t critical, but would be great to have a backup of some sort. Now i could just ntbackup everything, but that doesn’t give me a quick easy way to restore a single file, I don’t believe. I’m used to Backup Exec’s ease, but don’t really want to pay for an upgrade.