I used to be much better at documenting my quilts than I am now. I have two large thick scrapbooks that show most of my work from about 1985-2010 or so, before and after that I wasn't so good. One of the things I found was that pictures never really showed the colors well, so I would make a miniature block or at least sew a strip of the various main fabrics for my "planned" quilts. They go into those scrap books with the clear static pages just fine. The scrap and charmed quilts don't usually get that treatment.
I don't label my quilts either, I intend them to be use quilts and not heirloom quilts. I will for special occasions (like weddings or whatever) put on a label but it's rare. I should do better.
I keep a lot of stuff, all of it helps remind me of projects I've otherwise already forgotten. Each time I make a quilting pattern for example even though the likelihood is close to zero that I will use it again, I stick it into my drawer I have for that sort of thing. I typically do work up my designs in Electric Quilt and I print out pictures of the finished block and/or finished quilt. I have a box full of that stuff. I'll also write notes to myself about what went well or what I would do differently next time if there ever is a next time. Because of my vision issues I'll often make various templates or what I call "snubs" to help with my trimming. When I make them out of the clear plastic grid material I keep them and try to reuse between projects. I'm probably going to clear most of those out though. The "snubs" are usually used when I have to trim off odd corners or whatever, when I don't have to see through them I like to use the little cardboard pieces that fat quarters are often wrapped around. Those I can use and throw out freely and they are thick enough to provide an edge for the ruler.
In the past year I've started taking pictures again and storing them on a zip drive, I've had too many computers fail over the years losing too much data. Unfortunately I need to find a couple of those drives and put them on one specific one, also it's a minor pain transferring them from the camera to the zip drive, but I'm getting better at that. Due to my vision issues, camera photos aren't the best way for me to go and I don't take very good pictures. I don't have a smart phone (don't see well enough to be worthwhile) even though my old school flip phone does have a camera.