title: 99.99% durability. What does it mean?
body: <p>Amazon S3 offers two plans:</p>
  
  <blockquote>
    <p>Storage
    (Designed for 99.999999999% Durability)</p>
  </blockquote>
  
  <p>and</p>
  
  <blockquote>
    <p>Reduced Redundancy Storage 
    (Designed for 99.99% Durability)    </p>
  </blockquote>
  
  <p>Designed to provide 99.999999999% durability and 99.99% availability of objects over a given year.</p>
  
  <p><a href="http://aws.amazon.com/s3/#protecting">Heres the link</a></p>
  
  <p>So if I have 10 000 files I can expect to loose one in average with the second plan per year? am I interpreting that correctly?</p>
  
  <p>Edit: Maby I have to put it more clearly:</p>
  
  <p>How do you interpret especially the "designed for" part. If for example offer 99,9% availability I guarantee that and pay a penal for every hour more or something like that.
  But if I design the system for 99,9% availability, I choose the parts with the knowledge that the system will probably have a downtime of 0.1% on statistical average.</p>
  
  <p>That does not necessarily mean that I guarantee anything. Its just what the system is designed for...</p>