As a sort-of-update on my last entry, I found a script that will autosave every minute I'm windowed into SAI. It's here if you want to try it! http://aiffe.tumblr.com/post/719363.....paint-tool-sai

Here is  xial's 5 and 15 minute interval autosaves if 1 minute is too aggressive for you!: https://www.furaffinity.net/journal/6454996/

So far has worked great for me. :)