Who is maintaining our data-centers? Amazon!
Our entire computing infrastructure is based on Amazon Web Services, the leading cloud services provider. Amazon has been managing a huge amount of data and private information reliably, efficiently and securely in the last few years, and it's that infrastructure they're exposing through Amazon Web Services. This means that we're able to offer enterprise-level uptimes, replicated across multiple data-centers storage... (see AWS Security Whitepaper)