If you would like to backup your settings for safety measures or simply because you plan on reinstalling the tool on a different machine.
To backup your settings simply copy your save folder which is located at:
If you want to replace the save settings on your device, first make sure GMT2 is not running. Then delete the existing save folder and paste your backed-up save folder.
If you are unable to find your AppData folder, do note that this folder is hidden by default on windows. You can check this article for more help.