Syncthing

Software to synchronise files between devices without the need of a cloud server.

Install “Start Syncthing” from the “Software” application.

Open the application “Start Syncthing” this will show you your background. Go back into the application menu and open “Syncthing Web UI” Install and start Sync thing on the other device. Share some folders and start syncing.

more at https://syncthing.net/