I use both methods. Computers and a 3 ring notebook. When I save an internet pattern (so many free ones out there) it goes into a quilting folder that has many subfolders. Some of mine are author, size, type, difficulty, etc. Some patterns go more than one place.
Than when I've worked on one, or if it is on my bucket list, I print it out and it goes into a plastic sleeve in my binder. Also pattens I take, or photo, out of magazines are in this binder. The binder is subdivided into areas much as my computer.
My computer is also set to back up to an external hard drive every night so my files are safe if my computer crashes. I've had 2 crashes so am more careful now.