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Backup software recommendation?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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FreeFileSync is FOSS and works pretty well for me. It can be set up for automated sync on a schedule or you can just manually sync files between two destinations. I haven't really tinkered with the automated stuff but if what you want is to open up a program and hit a button to sync, it can definitely do that.