How do you handle redundancy?

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Most of our critical services are highly available with redundancies, load balancing, Multi A-Z deployments etc. e.g Our application servers are horizontally scaled coupled with AWS Elastic Load Balancing (ELB). e.g. Our database storage supports availability across multiple zones in a region via AWS Relational Database Services (RDS).

We do daily backups of our database and take AMI Snapshots (Amazon Machine Images) snapshots of our application servers as emergency backups.

What is the approximate API Response time?
Have you ever had an outage and how did you respond to it?