But Backblaze is cheating in how they compare pricing, because they compare to a much more expensive S3 storage class. In the "4TB disk crash" case it's really not as their website describes:
AWS: $ 48/year to store, $ 312 to retrieve Backblaze: $ 240/year to store, $ 40 to retrieve
If I store it for more than 17 months before the crash, Backblaze is actually more expensive than AWS.