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Plenty. One of the easiest to use is probably Syncthing, if you’re thinking of self-hosting.

You're talking about their subscription, Google [Removed for DMCA Violation]?

I use Dropbox for almost 10 years and I have been using it well so far!

Dropbox offers great file history and restoration support. One day I deleted files permanently then the team kindly supported my case to restore the files within a day.

Depending on how technically inclined you are something like Tarsnap might be a good fit. [1]

[1] https://www.tarsnap.com/