Description: The protection of data and intellectual property in our data centers is one of Google's top priorities.
Rather than storing each customer’s data on a single machine or set of machines, data from all Google customers (consumers, business, and even Google’s own data) is distributed amongst a shared infrastructure composed of many computers located across Google’s many data centers.
Data is chunked and replicated over multiple systems so that no one system is a single point of failure. Data chunks are given random file names and they’re not stored in clear text, so they’re not humanly readable.
This video tour of a Google data center highlights the security and data protections that are in place at our data centers.
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its really a fantastic video . more information regarding the same is on
https://docs.google.com/file/d/0B5Y-fwYJF2hLOTVmMzQ1MjAtMDFmNS00YjFhLWI3MmUtZjI5MDQ5Mzc3NmMz/edit?pli=1
Haha :) google is not a small company. obviously he will take care of every small small things.