In my enviroment I have a share where a deduplication backup software writes its backups. To avoid using tapes drives as the media to move data to an external site, I choose an Azure storage blob to move the share (5Tb) . Now see how.
Now , under “resource group” create a new dedicated resource
now go to resource
go to copy the key
Now, under Synology install the “Cloud Sync” and paste the “access key”.
Select the path from where and to where “Remote path”.