AWS News Blog Multi-AZ Support / Auto Failover for Amazon ElastiCache for Redis Like every AWS offering, Amazon ElastiCache started out simple and then grew in breadth and depth over time. Here’s a brief recap of the most important milestones: August 2011 – Initial launch with support for the Memcached caching engine in one AWS Region. December 2011 – Expansion to four additional Regions. March 20