I haven't used rclone, but `rsync --link-dest` lets you create an incremental snapshot using hard links so that you don't have duplicate files between snapshots. Wrap it in a shell script, and you have something surprisingly useful.
rsync --link-dest can't do content deduplication, can't upload to the cloud and it's much more inconvenient to use for doing and managing backups than Duplicity, Duplicacy or Duplicati.