When they dropped support for XFS, I was locked out and happily went looking for a replacement.
Syncthing ( https://syncthing.net/ ) does everything I need. Instead of some nameless cloud company hosting my stuff, my 'cloud copy' is a big USB hard drive on a Raspberry Pi.
I still have to keep Dropbox because of a couple of multi-org projects I'm involved with use it. I'm done putting my personal stuff on it, though.