How to backup WD Mycloud incrementally to a second NAS?

I’m using WD MyCloud as a central storage in my home network and want to implement a regular incremental backup on a second NAS via LAN. (not a complete 2TB-snapshot every time!!).

Is there any standard way to do this, based e.g. on rsync? I’d prefer a solution with direct NAS-NAS communication without involvement of an additional PC.

If you do a site search (via the magnifying glass icon in upper right) you will find quite a few threads on using rsync to sync data between a My Cloud and other devices. Here is a couple of those links.