I'm not sure it's even necessary to use Internet Archive or a torrent? If I own an NFT whose hash is stored on-chain, I can just ensure the availability of the preimage by storing it myself.

Then when I want to interact with a centralized NFT marketplace, I can upload the preimage to their server. They'd verify the hash and store the image. I'd continue storing it myself though, so if that marketplace goes away, I can follow the same process with another one.