Sending file over network

I want to synchronise save game file between two devices over LAN or internet. I want the first device to be the server and the device being synched as the client. I am thinking of using the Unity's Network class for that with RPCs. Need suggestions on best way of doing this. Also is there a way to connect server with a client on the Internet without a fixed IP or domain?

I have the same probleme, I can’t find the way to synchronise save game file over LAN or internet. Has someone found how to do this ?