Cold storage is the retention of inactive data that an organization rarely, if ever, expects to access for years -- or perhaps decades.
Low cost, high capacity and durability are important considerations for cold storage. Data retrieval and response time can be significantly slower for a cold storage system than for devices or systems designed for active data and media choices often include cloud storage, linear tape file system (LTFS) tape or low-cost commodity hard disk drives.
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Cloud services that cater to cold storage include Amazon Glacier and Google Cloud Storage Nearline. Currently, Amazon Glacier charges a penny per gigabyte per month to store the data, and a certain percentage of the data can be recovered per day at no cost. Facebook has also devoted considerable attention to a Blu-ray cold storage system through the Open Compute Project.