The same commands that one uses to copy to a USB drive (rsync) should also work for copying to another NAS like the My Cloud. The sticking point often comes with Shares configured for Private access. One may have ensure one user has Full Access to all Shares on both machines.
You can thank WD for that. The first gen single bay My Cloud had an option in the Safepoint backup feature to backup to another LAN target. WD, for what ever reason, removed this particular option in the second gen single bay My Cloud.
The rsync option should work it just may take some experimenting to find the right commands/options to get the two units to communicate.
