Veritas software is embedded in Windows XP for backups FWIW. You can get a trial version of Veritas. Veritas primarily used for hot/or not backups of large datasets and filesystems.

We got a new version 9.1 a while back and had a load of problems, chiefly that it took MUCH longer to restore disks than with the previous version we had. The sysadmins eventually got things under control.