Actually, GEH stores their archived films in an air conditioned underground vault nearly the size of an airplane hangar. Most of it is nitrate original, for which nothing much can be done. The rest has been copied and in the case of color exists as 3 color separations. Hollywood does much the same. Three color separations in one location and the ECN originals in another. No one is so foolish to have only one copy nor to store both in the same place.