The whole folder, yes. Just unzip it once, rename the folder to your game title, and then unzip it again, and rename the second, new folder to the second game title.
So, say I was already working on one game and then decided to make another; would the second game replace any of my previous files that I had made for my first game?
I don’t see why it would, since both folders are completely independent from one another. I don’t think the actual code you use is stored anywhere but the dfabulich folders.
Yes you can, I have 3 in various states of completion. I’d have to say it’s not a great idea though, I’ve a few stories from just about done to only partway finished instead of 1 completed one. Anyway if you do it, just copy the source file. If you want to make sure they’re separate and you don’t mix them up make folders for each book and put a copy of the source folder in each.