Dark data is the unstructured information companies collect but never use,...

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

Dark data is the unstructured information companies collect but never use, often making up 55% of all stored data. This unused data not only wastes storage and backup resources but also increases exposure to ransomware attacks and data breaches