How to save photos?

If you want to preserve it for a long time, you must seal it with plastic to isolate oxidation, so that it can be preserved for a long time, and then put it in a carton, preferably a plastic box or an iron box, and put some mothballs in it, just like a sweater.

As for CDs, you'd better back up more copies. After all, carving a Zhang Cai 3, 4 yuan will be redundant because of the poor quality of the CD for a long time.