Old lesson archive

Having been on these sites since the dawn of time, there is one thing I have always found a little sad both as a teacher and a student. When a new teacher steps in, they will (as they should) replace the lessons, this, however, means that old lessons that some may have loved deeply or put a lot of work into get lost forever, never to be seen again. I would therefore love an archive of some sort (or even just put it as library books if that makes the most sense code-wise) where all past lessons get put in. This would of course require some extra work, but when the HM is looking through and approving lessons anyway, they would simply add the code to a separate list for safekeeping, and then once the teacher stops, or eventually makes new ones, these could be put into an archive somewhere. Personally, I would love to hand out a little sugar mouse or something to people who bothered going back and watching my old lessons and do them as well. Of course, they could not get house points for it like this, but for some, like me, it is about the story far more than the points. This would also give an opportunity for former students to revisit lessons from their actual time and get more of a feel for those lessons they missed back then.