Feel free to join others who have requested the ability to backup the My Cloud to online storage sites like Amazon, Dropbox and others over in the Cloud Ideas subforum. There are several threads including the following requesting that feature.
https://community.wd.com/t/implement-onedrive-synchronization/97084
https://community.wd.com/t/headless-backup-to-online-storage/97077
https://community.wd.com/t/mycloudex3-support-amazon-s3-good-please-get-amazon-glacier-support/97000
