Backup programs recomendations

[Arturo Alejandro Hoffstadt Urrutia]

Hello:

I have to implement a backup system for a whole department, inittialy covering 
about 40 PC, and the growing...

I don't want to use scripting, because I have to work cross-platform (windows 
and linux, maybe mac). I want a more serious (I ment no disrespect, but bash 
and perl are scripting language, not backup system... and I don't want to 
develop the whole backup system)...

Also, I need backups in DVD o CD... I known the tape are a more reliable and 
better choice, but i'm stuck with it...

Does someone know a good alternative... I've haved googled, searched, even 
tried many systems, but I want opinions from people with experience...

PD: A... it has to be free-software (Maybe I need to code on it)
PD2: Please, not a STFW!!!!!

Happy New Year!
-- 
Arturo Alejandro Hoffstadt Urrutia
Estudiante Ingenieria Civil Informática
ahoffsta at alumnos.inf.utfsm.cl
"La Magia existe, solo debes buscar mejor"