I've been looking at older animes and noticed that quite a lot of their official art has been lost to time without it ever being properly archived.
However, I managed to find some of them on third-party sites.
It made me wonder where exactly people get the official source from.
Are the official artworks permanently lost to time, or is there an archive somewhere?
I made sure to search for a question like this online, but nothing came up.
I tried using reverse image search engines, but they don't always find something.