If you’re using Steam and don’t want to install the save manager and editor, I suggest you to take a look at this post. It helps you to find the savefile of your game, so that if you make a copy of it and store it when you’re near the epilogue (or the final chapter, so that you may be able to save new variables if they add them) you can resume from there when they’ll implement the save system on the game, thus saving your favorite playthrough in quite a simple way!
It’s true that it’s feasible only if you’re playing on Steam but I think it’s a good and direct way to save your game or to create checkpoints.