I'm in need of more external storage, and more specifically storage with safety features built in (RAID etc). I'm looking to buy an rMBP and my Dad has a MBA, ideally I'd like to be able for them both to access the files over WiFi, so great, get a NAS right? I was looking at the Synology ones, seem fairly cheap for a 2 bay, access from the internet, iOS apps etc, can create a 4Tb RAID1 which should be enough for now. But then it doesn't act like an actual external does, I was hoping it would just appear as another drive connected, it might seem nitpicky as it seems to act like one but it just doesn't appear like one. But then regular externals don't really work as when the rMBP isn't docked at a desk they're unplugged and not accessible. I was also wanting both devices to be able to backup via Time Machine to them. A NAS would allow me to access the files on it over the internet, which would be a plus if I'm away from home and need to access something I've archived. My original thought was a Time Machine, but it's not RAID, and does so little for the money. The wireless Router would be nice but not essential. I have a Gen1 TC which is faulty meaning it can no longer use it's internal drive, I'm wary of something similar happening again.