Versioned backup solution for up a 50MB file: free or paid solution

I need to backup a Sage accounts file 50Mb file from a Win 10 file server.

I need a reliable solution because the server in question is not monitored. It only gets checked around 3-4 times a year. I know there are loads of free sync utilities out there but I am specifically looking for a cloud-based solution that does versioning. So for example, if corruption or ransomware did strike, there would be at least 3 or 4 other copies to revert to?

If this has to be a paid backup - so be it.
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furunoAsked:
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Chris BowdenCommented:
i use mozy pro
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