Checkpoint64 has a preset for Barotrauma: it already knows where the save folder is, backs it up automatically and keeps every version. Everything this site has on Barotrauma:
Barotrauma
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Save file location
Windows:
%LOCALAPPDATA%\Daedalic Entertainment GmbH\Barotrauma
macOS:~/Library/Application Support/Daedalic Entertainment GmbH/Barotrauma
Linux:~/.local/share/Daedalic Entertainment GmbH/Barotrauma -
Launch options
-skipintro -
Sharing with friends
How to share your Barotrauma world with friends, from playing live to taking turns when the host is offline.