Syncthing is an open-source file synchronization client and server.

Install and configure Syncthing to run at boot.

# pkg install syncthing
# sysrc syncthing_enable=YES

# mkdir /var/syncthing/
# chown -R syncthing:syncthing /var/syncthing/
# chmod -R 750 /var/syncthing/

If this file doesn't already exist, start the syncthing service to generate it. Stop the service again after a few seconds.

# cp /usr/local/etc/syncthing/config.xml{,.orig}

Update the config file and make the following changes:

# vim /usr/local/etc/syncthing/config.xml

• Change <folder path="/Sync" ... to <folder path="/var/syncthing" ...
• Change <defaultFolderPath> to /var/syncthing/

Allow incoming traffic on these ports (and then restart your firewall after to load the new rules):

• TCP 22000
• UDP 22000
• (OPTIONAL) TCP 8384 (Syncthing's admin panel, only expose this port if you want to be able to allow remote configuration of this server)

server {

  listen 80;

  server_name syncthing.yourdomain.com;

  root /usr/share/nginx/syncthing;
  access_log /var/log/nginx/syncthing.log;
  error_log /var/log/nginx/syncthing.err;

  location / {
    proxy_pass http://127.0.0.1:8384;
  }

}

# service syncthing start

Browse to the Syncthing control panel to start using the tool

https://[your-servers-ip-address]:8384