On 2019-Sep-16 15:48:36 -0600, "Nelson H. F. Beebe" <beebe@math.utah.edu> wrote:
>I came across an article today about another major industry that has
>been exceedingly careless about preserving its history:
>
>        Wipe Out: When the BBC Kept Erasing Its Own History
>        https://getpocket.com/explore/item/wipe-out-when-the-bbc-kept-erasing-its-own-history
>
>It is a must-read for Dr Who fans on this list.

It didn't only affect TV, much of The Goons originals were also destroyed (at least
one episode now sold by the BBC is an off-air recording by a fan because that's the
best extant copy).

And NASA destroyed the tapes holding the original Apollo 11 moonwalk 
(https://en.wikipedia.org/wiki/Apollo_11_missing_tapes).

-- 
Peter Jeremy