Dark data is the vast amount of information companies store but never use—up to...

https://wiki-site.win/index.php/How_Do_I_Stop_Dark_Data_From_Coming_Back_After_Cleanup%3F_91294

Dark data is the vast amount of information companies store but never use—up to 80% can sit inactive. It matters because this unused data costs businesses around $2.5 million every year in storage and management