Dark data refers to the 55% of stored information that organizations keep but...

https://magic-wiki.win/index.php/Why_Do_AI_Agents_Cost_More_When_There_Is_Too_Much_Dark_Data%3F

Dark data refers to the 55% of stored information that organizations keep but don’t use. Holding onto this inactive data not only wastes storage and backup resources but also increases risks like ransomware exposure