I think ~~rsync~~ rclone is the correct tool to meet your needs. I'm not good with it so I can't help with the specifics.
As for sharing, you can manually pick a folder to share and give the link out as you please
I'm looking for a system that uses proton drive. So prefer not to rely on rsync even though it may solve an issue.
Whoops, I meant rclone.
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