It’d be worth checking out Borg as an alternative to rsync. Borg will handle snapshotting, and automatically de-dupe on a block-by-block basis.
I use it for all of my remote backups, and it provides a lot of quality of life stuff that rsync isn’t going to handle.
There is a subscribe button, it’s directly below the channel name. Up until recently there was a bug in invidious preventing it working but it looks like that’s been resolved now.