I have a home network (my main PC, a wireless laptop and a digital media server). I have an old Dell computer with a PIII 550 processor, 512 MB of RAM and a 10 GIG HD. What is the best use of this computer? As a file server or a file backup system? I use a peer-to-peer program. Would it be a good idea to run this off the Dell rather than my main computer (a Gateway P4 2.8 system)? Would it be a good idea to spend a few hundred dollars to upgrade my memory or storage, or is that a waste on a system so old?