Checkpoint64 has a preset for Sons of the Forest: it already knows where the save folder is, backs it up automatically and keeps every version. Everything this site has on Sons of the Forest:
Sons of the Forest
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Save file location
Windows:
%USERPROFILE%\AppData\LocalLow\Endnight\SonsOfTheForest -
Backup guide
Sons of the Forest keeps one live save per world, and whoever's hosting is the only copy that matters. Checkpoint64 keeps every version so a crash or a bad session doesn't cost the base you've built. Free download.
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Sharing with friends
How to share your Sons of the Forest world with friends, from playing live to taking turns when the host is offline.