S3 is about as low level as it gets, if S3 is having a bad day a lot of things will come to a grinding halt. Yet while S3 going down in 2017 generated a lot of

S3 is about as low level as it gets, if S3 is having a bad day a lot of things will come to a grinding halt. Yet while S3 going down in 2017 generated a lot of headlines, there was no systemic impact like (say) the stock market tanking. Which leads me to think that most (not all, but most) really critical stuff will have backups outside us-east1.