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 Arc

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.