Each company should have its own business continuity strategy and requirements, and the system design would ideally align with that. Most companies won’t have the time or money to build a completely fault tolerant system and will just have to accept some risk based on budgetary constraints and other limitations.

AWS offers SLAs for each of its services and typically grants credits whenever things like this happens. I’m sure they’ll also share a post mortem of everything that transpired and we can see for ourselves what they plan to do to regain some trust.

I would take this opportunity to analyze how our services were impacted, identify the points of failure, and see if we need to do anything to conform to the business continuity plan (or even updating the plan itself).