[hirako2000]

That already got sorted and worked for books, at least in the UK.

The British (National) Library held and still holds the duty to acquire in the form of legal deposit, at least one print of each book published in the UK.

So every single book published gets stored in there, and has been since its inception 50 years ago.

It gathers 170–200 millions unique items, and counting.

With free access to anybody, able to physically access the library. It has a budget of less than £150 million.

I bet implementing an archive of digital content would be a cheaper and despite more technologically challenging would remain do-able with a reasonable number of techies.

Oh isn't it what the Internet Archive is, and even more? Is that not what they've attempted to fulfill for a while now and the primary reason they haven't accomplish it is due to a legal war with large IP distributors and their armies of top paid laywers shaping the interpretation of copyright legislations?