The biggest AWS outage in the past 3 years was S3 being down in one region for 2 hours in Feb 2018 ... No other regions were affected, except for global APIs (

The biggest AWS outage in the past 3 years was S3 being down in one region for 2 hours in Feb 2018 ... No other regions were affected, except for global APIs (e.g. create S3 bucket), which one shouldn't rely on on your critical path. Many new customer features have been delivered to allow mitigation of this kind of failure (e.g. cross-region S3 replication). AWS had a power failure at one data-center in us-east-1 earlier this year, which had very little impact (basically only customers who didn't have sufficient redundancy in other AZs were affected).