Do a search for cron
to find several discussions on how to try and possibly get around this issue with the second gen v2.x single bay My Cloud units. Here is one such discussion:
https://community.wd.com/t/how-to-run-a-user-boot-script-at-mycloud-gen2-2-11-xx-devices/169822
I suppose one could always download the GPL firmware for the v2.x single bay My Cloud (http://support.wdc.com/product.aspx?ID=904#WD_downloads) and roll their own firmware that includes the cron job or other edits to facilitate backing up from one v2.x single bay My cloud to another v2.x single bay My Cloud.