When "11 Nines" Met Human Error: A Real Incident in S3, IAM, and Durable Storage

https://bizzmarkblog.com/why-temporary-urls-and-expiring-tokens-break-at-scale-lessons-from-production-incidents/

How a Series B Cloud Company Nearly Lost Customer Backups Despite S3's 99.999999999% Durability At 24 months into operations, our infrastructure team at a data backup startup faced an audit and an internal incident at the same time