“The word hindsight is key. It's easy to find out what went wrong after the fact, but the overall reliability of AWS shows how difficult it is to prevent every failure,” says Ira Winkler, chief information security officer of the reliability and cybersecurity firm CYE. “Ideally, this will be a lesson learned, and Amazon will implement more redundancies that would prevent a disaster like this from happening in the future—or at least prevent them staying down as long as they did.”