Is that like the usual blockchains where every computer has to store a complete copy? That would get huge with the Internet Archive.

There are distributed filesystems with redundancy, but the last time I tried something like that, it was extremely slow for both reading and writing. For an offline archive it might be feasible, but you’d have to do a lot of redundancy and error correction to be sure you didn’t lose chunks. Plus, the Internet Archive is so big that even with the data distributed, each participant might have to store a prohibitively large amount.