New Save File

[Squirtle™]

I'd like to introduce a friend to the game and play duo with him, but I'd like to start fresh alongside him. Is there any way I can create a separate save file or a brand new game while backing up my own game for later use?

[Casurin]

Yes.
You can move your save-files out of the way.
AppData\Local\CrabChampions\Saved\SaveGames