BitTorrent Sync will synchronize folders between any number of machines on either a local LAN, over the internet, or via both. It synchronizes without using a central server as everyone is a peer, it is a peer-to-peer (P2P) network.
Use MQTT to send little packets of data around. My current thinking is that any sensor/data network should be a mixture of MQTT and Rest. They are different things and both provide some nice features. I like MQTT because:
I’ve written a few versions of this. In previous versions I would control everything from a Python prompt, or a complex flask app, or use DIO to trigger video.