The final product
is on film. The individual elements, i.e., the model shots in front of the bluescreen, the separate animation cels, have long since been destroyed for the most part (the snipped color footage from "The Cage" very nearly was), so there's really no way to recomposite those effects shots. You can only recreate them from scratch, which means either dragging the 11-footer out of retirement, or cobbling together another model, and doing a lot of expensive blue and green screen work, or going the CGI route.
As for the film that is
still around, what isn't in private collections is being kept by Paramount in a salt mine, where it's expected to last around a hundred years.