I've been using ownCLoud (owncloud.org) on a raspberry pi set up on my LAN to solve this type of problem. While I don't have it publicly facing, as soon as I get home, any file I was working on is synced to the rest of my computers and devices.

With docker being ported to the rasberry pi recently, I suspect it will be even simpler to set up an ownCloud for $35 + the cost of storage.