What is a good, backup software for linux?

We have 3 linux (RedHat ES3)

We are thinking we want commercial software, but open source software is not out of the question.

I definitely want a central management interface, so I can schedule/backup/restore, from on single machine/tape drive.

I want something with DR bare-metal restore capabilities.

Ease of installation, and administration, is much much preferred — If there are specific advantages (and really good documentation community support, like for a good OpenSource option), I might be willing to give a little “ease” up — but for the most part we want something that wont take a lot a time to set up and maintain.

Not necessary but .. We might actually decide to use DVD DL media for our backups. If we did, it would be nice if the software had a windows interface for the management, so the discs could be burned from on the windows machine with the DVD DL drive.

Anyway — interested to hear what people thing about the different options that are out there!!