Dark data refers to the inactive or unused data that companies keep but don’t...

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

Dark data refers to the inactive or unused data that companies keep but don’t analyze—often around 60-80% of stored data. This not only wastes storage and backup resources but also increases risks like ransomware attacks