I would like to build a linux media server. My first question is why do many people talk about making a server out of an old unused pc sitting in the corner? I would like to store all of my movies and music plus back-up my pc's and imac. If i do all this work on a server i would like my files to be safe and would to reach them whem i'm on the road. I think Raid 5 is a good idea and would have 3 to 5 Tb of storage. I am looking for some thoughts on choosing hardware. Thank you for your time.