Managing save files

Infinifactory functions off a single save file. It also innately does not feature any kind of save file management options, which means that you cannot delete your progress in-game. That's a kind of a problem for speedrunning, 'cause we need to reset our progress in order to even start a run, so here's how to actually reset your progress (on Windows 10, anyway. It's similar on other versions of Windows, but I don't know about Macs):
1° go to Documents/My Games/Infinifactory/<bunch of numbers that are player specific>
2°  Open the save.dat file in notepad or whatever.
3° Delete all lines of text EXCEPT the "UniquePlayerID = <bunch of numbers>" line, which is the second to last line in the file.
4° Save and exit.
5° ???
6° Profit (aka WR in the speedrunning world)

If you look around in that save.dat file, you can see some neat things, like whether some story progress have been triggered, the location of your precious food pellets and what your puzzles solutions look like when put in hexadecimal(I think?) code. This means you can transfer solutions between save files (although you should be careful. If a solution is misplaced in the file, the game won't boot up. Simply delete or move the new solution to fix the problem).

Personally, I keep multiple save files under different names for various purposes. I have my "Original save.dat" with my first playthrough strats and the schematics I initially fooled around when figuring out how to speedrun this game. I have an "Overlord completed save.dat" for whenever I want to do a run of the resistance campaign. And of course I have a save.dat file, which is whichever run I did last. Simply copy and rename any save file you have AS save.dat for it to be file you'll be running off of.