For porn games, Unity. It uses a hell of a lot more resources than Ren'Py for the same visual experience, but no rollback.
For regular games, Unity also. Whenever I play any games made in Unity, my PC almost takes off. Like I'm playing Cyberpunk full details.
Just Folders. Keep the saved games inside the folder with the game name and latest version, rename folder after play with latest version and keep just the saved games.
I had a save from before chapter 3 started, maybe 3 minutes of gameplay at normal speed. I loaded that and (as I usually do with all games) I tried to roll-back (mouse scroll up) to read up and re-familiarize myself with the story. Realized mouse scroll doesn't work, I clicked left side of...
Looks like rollback got disabled in this update (yes I have it enabled in preferences).
EDIT: finished the update, it feels like some ADHD on drugs, and not the good kind.