Archiving our popular science legacy

UK residents will probably be familiar with the long standing BBC TV series - Horizon. Wikipedia describes it's mission statement as....

The aim of Horizon is to provide a platform from which some of the world's greatest scientists and philosophers can communicate their curiosity, observations and reflections, and infuse into our common knowledge their changing views of the universe.

....and the program has been running since 1965 and shown close to 1100 episodes.

I finally got around to watching an episode I had recorded from Nov 2009 - Why do we talk? - and wanted to see if the episode was still available on the website so that I could recommend it to others.

It isn't.

We seem to hear all the time that valuable news and other TV footage that was recorded on traditional media has been lost or destroyed. With digital formats isn't it time that this stuff was permanently archived and made available to all for ever?

I know it costs money to store it but somebody has got to do this.