When it comes to storage, Facebook is learning to do more with less.

For backup copies of older content, the social network is building “cold storage” facilities that are designed to keep data available without some of the expensive, power-sucking features found in a traditional data center. Facebook says it’s built in strong protection against data loss while reducing the overhead of additional storage.

These are data centers designed to hold more than an exabyte of data—1,000 petabytes—with no redundant electrical systems, while consuming less than one-sixth as much power as a conventional facility. And they store all that data on cheap, consumer-grade media.

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