If they're listing clouddrive as a supported backup solution that seems sort of suspect because it was never intended to be used by backup programs such as this to store TB's of files and they started cracking down on that long ago I believe. If you're wanting to use AWS for backups they want you to be using the "real" s3 services.
That's long-solved, since they kicked everyone with lots of data off and switched it from unlimited to 1TB. At this point there's no good reason to restrict people from using something like rclone.
If people switched to the 'proper' backup service they offer on AWS, that would be glacier, and they would get significantly less money!
