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Following up on what Christopher said, I would make sure that the physical construction and design of the facility were in line with the types of weather/natural disaster events one might expect in that location. For example, if it is located in an area that is prone to hurricanes, it should be constructed to withstand high winds and large volumes of rain (and not be located in a floodplain). Backup power should be sufficient for days, not hours, which generally means large diesel generators. Another thing that is sometimes overlooked is the physical security of the facility. The company we contract with for online back-up and recovery solutions has 24/7 physical security, and is fenced and gated. One thing that you can look for to help ensure that the data center is reasonably secure is SAE SAS70 certification.