Wow, those Mitsui Gold archival DVDs have a 24-karat gold reflective layer and are rated to store data for 100y. Given the stability of gold, and the ubiquity of that disc form factor, you could probably read it in 100y too.

That price on Amazon sets us at about 3500s to record 4.7 TB for 100y+ Much cheaper than inscriptions.

One could even store a commitment to that Disc, filesystems contents, and physical media metadata in a slightly larger OP_RETURN, have that OP_RETURN added to a batch withdrawal tx from exchanges (these will always exist and are quite space efficient). Exchanges could physically warehouse gold discs and online (similar to cloud cold storage services).

Exchanges then sell cold warm and hot GOLD ETCHED “inscriptions” with a nice clean prunable onchain outputs. Exchanges then have an ongoing revenue from hosting and charging for outgoing traffic, ideally in sats.