Glacier is significantly cheaper than S3 Yes, as long as you put something in and almost never take it out. They charge for deletions in the first 3 month

Glacier is significantly cheaper than S3 Yes, as long as you put something in and almost never take it out. They charge for deletions in the first 3 months What if this is just disincentive to pull content out and treat Glacier like S3? Power is not the driving cost for Internet scale infrastructure It is not the only cost, but it is still one of the largest factors, no? Sony and Panasonic continue to invest in a product that has no visible commercial uptake That means nothing in and of itself. The only person who will win such a market needs to be one of the first there, innovator's dilemma, etc. Facebook believes optical is a reasonable solution to their archive needs Do they? I saw one mention in the author's previous post of James Hamilton commenting on a Facebook cold storage system using Blu-ray but is unclear to me if it is in production. Assuming it is true though, it is likely an apples-to-oranges comparison. Glacier provides archival restoration for presumably largely enterprise-level customers. Facebook backs up data from users, and I'd presume this is from deactivated accounts, etc., and unlikely to need urgent restoration.