Dark data is the information companies collect but never use. It can be 60-80%...

https://bravo-wiki.win/index.php/How_Do_I_Find_Dark_Data_on_a_NAS_Without_Breaking_Anything%3F

Dark data is the information companies collect but never use. It can be 60-80% of their stored data, taking up space and costing money to manage. This unused data creates risks and slows down systems