The subject of backing up one My Cloud in one location to another My Cloud in a separate location has been discussed at length in numerous previous threads. Use the search feature (magnifying glass icon upper right) to find the many past discussions.
The bottom line is that the older v4.x single bay My Cloud units cannot officially backup to a remote location using the SafePoint backup option. The newer v2.x single bay My Clouds do have an option for Remote Backup. It is explained in the v2.x My Cloud User Manual (http://www.wdc.com/wdproducts/library/?id=439&type=25), Chapter 10 Managing Backups, Creating a Remote Backup.
Unofficially it may be possible to backup a v4.x My Cloud to a remote My Cloud using Rsync. Some discussion on using Rsyc can be found in the following thread:
https://community.wd.com/t/my-cloud-replication-over-the-internet/95670
Here are just some of the previous threads discussing remote backup:
https://community.wd.com/t/backup-to-mycloud-from-another-network/165307
https://community.wd.com/t/remote-backup-issues-help/164458
https://community.wd.com/t/remote-access-and-backup/161471
https://community.wd.com/t/help-new-customer-keeping-the-drive-at-another-location/161354
https://community.wd.com/t/back-up-devices-to-a-remote-my-cloud/155950
