Can any teachers offer organization advice?

How do you organize and store for future access all the lessons, ideas, support materials you have from being a teacher? Looking for some sort of way to organize all of these piles of papers into a preferably digital system. I’m not teaching now, but I will be in the future and I don’t want to throw all this stuff away. I’ve already got things in piles, organized by novel, which I had removed from their previous home in binders/plastic sleeves. Suggestions? Advice?