I have 3 computers: 1 Desktop Windows, 1 Macbook (alum), 1 Macbook Pro. I also have a PS3. Looking to setup network storage but not sure what my options are. I'm aware of network storage devices which backup and share, but can I setup the same thing with an extra hard drive in my PC? Or perhaps an external hard drive? I basically want a separate hard drive(s) to do mirror and incremental backups, as well as share music, pics, docs, etc. with all three computers and my PS3. Thanks for your help!