I know threads like this have been made before but I read though them and didn't get the answers I was looking for. Please advise what I would have to do to get this scenario: I would like a hard drive that is accessible to everyone on my network (1 Mac and 3 PCs) to share/store important files. I just want the drive to show up on my computer like a flash drive I would plug into a USB. Is this possible and if so which situation would this be? Which is better to stream/access files from PS3? Can I password protect folders in either situation? Also, if I decide to use Time Machine can I only backup certain folders (just iTunes music for example)?