Comment by Uvix

Very few movies were shot on tape, and those that were did it deliberately for the effect of looking awful (Blair Witch Project).

For TV shows made in the US, they were still generally recorded on film, but then editing on tape became common in the late 80s. (In the UK, recording on tape was a lot more common. Not sure about other countries.) If there was enough interest in the show (and the company hadn’t destroyed the film), it would be possible to go back and reconstruct the show from the filmed footage. Unfortunately, I only know of one case where that happened, and reportedly disc sales weren’t enough to turn a profit.