When you back up data, you have plenty of methods to choose from. Most consumers have an external hard drive/solid state drive, and/or back up their data to various cloud services like SkyDrive, Dropbox, and iCloud. What about Facebook?
As for Facebook, its upcoming solution is low-power deep-storage hardware contained within a 62,000 square-foot building in Prineville, Oregon near its existing Beaver State data center. Unofficially referred to as "Sub-Zero," the facility will store a copy of the social network's data in case its primary servers need to be restored in an emergency. Instead of the hard drives being powered up all the time, drives will only be powered up when needed, conserving energy.
One of the company's existing server racks consumes around 4.5 kilowatts, while those at Sub-Zero are each expected to consume approximately 1.5 kilowatts once they're up and running.
Tom Furlong, Facebook's vice president of site operations, told Wired that there are hopes to create a similar building alongside the company's North Carolina data center.