Cold storage

• Cold storage is the retention of inactive data that an organization rarely, if ever, expects to access.

http://searchstorage.techtarget.com/definition/cold-storage

• Two Facebook data centers designed and built specifically to store copies of all user photos and videos started serving production traffic. Because they were optimized from the ground up to act as “cold storage” data centers for a very specific function, Facebook was able to substantially reduce its data center energy consumption and use less expensive equipment for storage.

http://www.datacenterknowledge.com/archives/2015/05/08/cold-storage-the-facebook-data-centers-that-back-up-the-backup/

• Under the hood: Facebook’s cold storage system

Two billion photos are shared daily on Facebook services. Many of these photos are important memories for the people on Facebook and it's our challenge to ensure we can preserve those memories as long as people want us to in a way that's as sustainable and efficient as possible. As the number of photos continued to grow each month, we saw an opportunity to achieve significant efficiencies in how we store and serve this content and decided to run with it.
https://code.facebook.com/posts/1433093613662262/-under-the-hood-facebook-s-cold-storage-system-/

• First Look: Facebook’s Oregon Cold Storage Facility

http://www.datacenterknowledge.com/archives/2013/10/16/first-look-facebooks-oregon-cold-storage-facility/

• What Happens in an Internet Minute?

https://www-ssl.intel.com/content/www/us/en/communications/internet-minute-infographic.html