I guess this a little bit of a hacky, complicated way to do it, but I think it might solve part of the problem. Setup a cheap VPS/Dedicated server to host all

I guess this a little bit of a hacky, complicated way to do it, but I think it might solve part of the problem. Setup a cheap VPS/Dedicated server to host all your images. A good example is BuyVM Storage VPS ($7/month for 250gb) or Kimsufi (10€ /Atom dedicated with 500gb HD). From what I see, people don't want to sync their stuff so much as it's keeping a copy on their computer, but they want a on the fly solution to edit, modify pictures etc. 1. Setup OwnCloud. Unless someone can think of a better solution, it's probably the easiest and there's already a iOS/Android app, so you sync all your pictures and what not. 2. Setup Samba/AFP. This is pretty easy, it's a bit harder to setup Bonjour for Mac people, but it's not really necessary. 3. (Optional) Setup a VPN, OpenVPN AS comes to mind as its simple as typing apt-get openvpnas (Debian guy here). Now you would have your own private cloud for under $15/month. Of course if your outside Europe/USA like me the upload speeds are gonna be pretty crap and probably not good enough for Lightroom editing and whatnot, but if you are I reckon the speeds would be fine. I have both a BuyVM VPS and Kimsufi dedicated, and I can easily hit over 10mb/s download/upload on both instances.