Checkpoint64 has a preset for No Man's Sky: it already knows where the save folder is, backs it up automatically and keeps every version. Everything this site has on No Man's Sky:
No Man's Sky
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Save file location
Windows:
%APPDATA%\HelloGames\NMS -
Backup guide
No Man's Sky ships large updates that change how saves are written, and its own save slots rotate. Checkpoint64 keeps every version of your NMS folder, so a bad update or an expedition slot you overwrote is one click from undone. Free download.
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Sharing with friends
How to share your No Man's Sky world with friends, from playing live to taking turns when the host is offline.