Yep, I regularly find myself answering my own questions from the past
Usually when I've had some details to hand or was working on a project at the time, and the knowledge has since become hazy through lack of use. I've found mailing list posts from the late '90s, as well as IRC logs from around the same time that I've been in. And, I have a very old upload that's been on Aminet since 2001...