Dark data is the information companies collect but never use—like old files,...

https://delta-wiki.win/index.php/How_Does_Komprise_Connect_to_NAS_and_Object_Storage_Without_Agents%3F

Dark data is the information companies collect but never use—like old files, emails, or logs. Studies show 60-80% of stored data sits inactive, costing businesses up to $2.5 million a year in wasted storage and management