Dark data is the 55% of stored information organizations keep but never use....

https://www.bookmark-suggest.win/dark-data-is-the-information-your-business-collects-but-never-uses-often-55-of

Dark data is the 55% of stored information organizations keep but never use. This inactive data increases storage and backup costs and creates hidden risks like ransomware exposure or data breaches. Managing dark data can save money and improve security