Storage in the cloud [closed]

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http://serverfault.com – If I save a document using a cloud based service, am I right in thinking that my file will be stored redundantly on a few DAS servers in a local data center. When I try and access this data again, how is my query routed to the server which contains my data, so say a copy of my file is stored on server 7 and server 27. I make my request for my file and somehow this request is routed to server 7 which returns my file. Are the locations of such files stored in a database, if so wouldn't this database server be overwhelmed, causing a single bottle neck at peak times? I don't see how this would be (HowTos)