title: how >=3 AZs guaranteed in AWS S3
body: <p>Amazon S3 gaurantees that the data being uploaded to bucket will be spread across >= 3 AZs.<a href="https://aws.amazon.com/s3/storage-classes/" rel="nofollow noreferrer">scroll down for chart</a>. When we create bucket, we enter region. How amazon manages this AZs number when we create bucket in the region where we have only two AZs? </p>