Do you store a copy of all class notes, slides, assignments, quizzes, tests, essays, etc. somewhere digitally, just in case you would want to come back and refresh your knowledge of whatever you did in class a few years down the line?
If no, then why not?
If you do, how meticulous are you about it? Do you store only digital things or do you also digitize physical notes and assignments? How do you store it: what medium do you store it on and how do you organize things?