Storage Media

Scenario:

I have 2 W2K Servers both PIV 1.8Ghz 512MB RAM PC333 40GB-HDD. PDC & BDC (just for labelling sake). PDC acts as a gateway for my internet & my file server. BDC acts as my workstation.

Questions:

1. What solution would fit if I wish to separate my PDC Files?
2. Is there a software that I can use, if I want to replicate my PDC files to BDC.
3. I’ve heard of NAS, just want to make sure if there is a 40GB/80GB only?

Can somebody help me as the requirements for me is very urgent…

Thanks in advance