cold storage vs refrigerator

cold storage

noun
  • Refrigerated storage. 

  • A place where private keys are stored away from the Internet to prevent them from being stolen. 

  • A state of postponement; the back burner. 

refrigerator

noun
  • A household appliance used for keeping food fresh by refrigeration (short form fridge). 

  • One who has a chilling influence. 

  • A similar device used to keep non-food items cold, such as blood, photographic film, drugs, or pharmaceuticals like insulin. 

How often have the words cold storage and refrigerator occurred in a corpus of books? (source: Google Ngram Viewer )