@sjb I'm guessing the logic being that rclone sync, in English sounds more correct to what it's actually doing. But coming from rsync, sync in my mind is checksum files that already exist compare and transfer those that don't exist or are differnet based on checksum.
clone copy is basically rsync, but in shell cp is copy. copying without checksuming is possible but it's slower because it overwrites files that might already exist.
I would have preferred rclone mirror