Checkpoint64 has a preset for Easy Red 2: it already knows where the save folder is, backs it up automatically and keeps earlier versions. Everything this site has on Easy Red 2:
Easy Red 2
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Save file location
Windows:
%USERPROFILE%\AppData\LocalLow\CorvoStudio\Easy Red 2\saves
macOS:~/Library/Application Support/CorvoStudio/Easy Red 2/saves
Linux:~/.config/unity3d/Corvostudio/Easy Red 2/saves -
Sharing with friends
How to share your Easy Red 2 world with friends, from playing live to taking turns when the host is offline.