You can save it. I've had the same playthrough prefs / viruses saved for over a month. The file you're looking for is "data.sqlite" and it can be found within the Firefox folder within your user AppData folder on your OS drive. I'd post the exact folder path, but it varies from pc to pc and as a kind fellow user here pointed out, it could give away personal info for my pc. If you can't find it, just do a file name search and you'll be able to find it. I've only been able to find that save file for Firefox, tested a bunch of other browsers, but couldn't track it down so you'll need to play the game in that browser for this to work. Once you find it, either copy and save it (it gets deleted when you clean your cookies and temp files on your pc), or use a program like CCleaner to mark it to be excluded from cleaning. Same thing and same file name apply for Trials of the Succubi, it'll just be in a different subfolder.