You're absolutely right. I was aiming for a baseline/ballpark here. At this scale, redundancy via 3x mirror is pretty expensive. You could likely get away with

You're absolutely right. I was aiming for a baseline/ballpark here. At this scale, redundancy via 3x mirror is pretty expensive. You could likely get away with something like chunks of 12 drives in raidz3, especially if you're planning on having at least a few facilities like this. $1m setup + land + a few salaries upkeep sounds like the kind of thing you could convince a few governments to do. However, Glacier won't do at all for the live Internet Archive, so it's a question of whether they want this to have live replication or not (if the whole backup is offline, who does your integrity checks?) I'm actually curious how much it would money/storage space it would require to print the entire Internet Archive on whatever the current equivalent of microfiche is (anything cheap and more permanent than magnetic or optical storage).