You may want to read the My Cloud User Manual (http://www.wdc.com/wdproducts/library/?id=439&type=25) to get a feel for what the single bay units are capable of and what their features are.
Generally the single bay My Cloud units will only backup to another My Cloud located on the same local network, or to another computer on the local network, or to an external USB hard drive attached to the My Cloud.
There may be ways, that will most likely involve some configuration via SSH of the My Cloud OS to enable remote backup or remote syncing. See the following recent threads where these issues are discussed. There are other threads that can be found by doing a subforum search.
https://community.wd.com/t/how-to-sync-myclouds-at-different-locations/150933
