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Well buying 220pb of storage space is really not the problem nowadays, at least from a cost perspective. But you need to maintain all that stuff. What happens when a disk goes broke, what if a network switch goes broke, how do you update your software at scale and so on.

I think it would be best to put it on AWS S3 Glacier Deep Archive for about 2.5 million dollar per year.

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2.5 million per year is about 10x what the worst case ongoing costs would be.

I doubt that you can do it cheaper. To permantenly archive the whole internet is an ongoing task that basically requires a small company, thats why Internet Archive (169 employee) exist (which costs more than 2.5 million dollar per year). It is not done with buying a huge bunch of disk. Setting up a permanent stream to S3 would be the only solution I can think of a single human could handle.

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