Question: Can I create more than one save file in the Windows PC version of Betrayer?
Answer: No. Betrayer is limited to one save file; with that said, you can manually backup your save file and revert to that save file anytime.
You can find your Betrayer save file in the following location: [User Account]\Documents\My Games\Betrayer\Binaries\Win32\game.sav
I suggest adding a number (game1.sav, game2.sav, etc.) to your backup for easier access, but you'll need to remove that number before you restore that save file to its original location.