Hello, the simplest way would be to use the cloud save system (you can enable it in the main menu / Play / Cloud save )
or you can manually backup the save folders located here:
- ~/Library/Application Support/GrizzlyGamerStudio/Robin Morningwood Adventure
- ~/Library/Application Support/com.GrizzlyGamer.RMAWhellcum
Maybe you'll have both folders, or only one.