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I think this is not an answer.
My sites currently sit on a server or set servers in a single datacenter.
Cloud computing is the use of computing resources (hardware and software) that are delivered as a service over a network (typically the Internet). The name comes from the use of a cloud-shaped symbol as an abstraction for the complex infrastructure it contains in system diagrams.
The hardware and location are about to change from a single datacenter where they show me pictures and description of their hardware (or leased hardware), the cooling and fire protection, earthquake proof stats, exact equipment info etc. to something nebulous they call the cloud.
[edited by: mack at 12:05 am (utc) on Feb 16, 2013]