Synology
How to back up data on Synology NAS to another server this should also work for a synology nas to another synology nas
backup via internet NL forum link, aldus deze pagina, poorten:
Network Backup: 873 TCP
Encrypted Network Backup: 873, 22 TCP
How to encrypt shared folders on Synology NAS (uses AES, untick auto mount for stealing, but need to input passd on reboot via web interface)