Amazon S3 is an object storage service which is Amazon’s one of the most durable, available and scalable service; maybe the best. According to the instructions, S3 can serve up to 99,9999999% durability and 99.99% availability. But these numbers are valid for a single region only. When it comes to a regional failure, you need more than a regional solution. Thanks to AWS, S3 has a built-in cross-region replication solution that you can use to replicate every file in a bucket very easily.