Dark data is the info companies store but never use—think of old files or...

https://wiki-aero.win/index.php/Why_Does_Dark_Data_Make_Search_Results_Noisy_Inside_the_Company%3F

Dark data is the info companies store but never use—think of old files or unused backups. It can be up to 55% of all stored data, quietly costing millions and creating risks like security gaps