Ah I see. You can't do it within the game, you need to rename it like you would rename any file on your OS.
Where is it?
I do not find.
When you click Save it should show your save directory at the top. Browse to that folder and your save file should be inside an "Autosaves" folder.
No, the backup file does not appear.
Ok try looking here to see if you can find it
C:\Users\<User Name>\AppData\LocalLow\Denki\Autonauts\Autosaves
