> I am trying to create backup servers out of the following specs:
> P4 3.0Ghz
> 1GB RAM
> RAID0 - 750GB x 2 (SATA)

As it was said by others, RAID 0 may not be the right choice. Virtual
tapes and tapespaning allows Amanda to extend a backup across several
physical disks, so you don't need RAID 0.

The only improvement that RAID 0 could bring you is speed to access
the disk array, but then the limitation could still be network
bandwidth rather than disk speed.

RAID 0 won't allow you to add more disks in the server (at least
without rebuilding the array), while you could just plug them in
simply if it was not RAIDed, and from your configuration you need many
more disks in the server.

One last question, from what you said, you seem you want to have
several servers, each backuping a set of clients. Why not havuing a
single backup server, with enouhg disk resources to backup all your
clients? It would be easier to manage I beleive.

Bests,

olivier