That’s what I’ve done, using rclone bisync and my crontab. Like I said it works well enough, but far from perfect. Using a beta backend with an experimental operation, according to the rclone website, puts me slightly on-edge.
I did try Celeste, but stopped using it for two reasons:
I use Budgie, so Libadwaita apps look incredibly out-of-place. Inconsistency like that makes me physically uncomfortable.