Dark data is the information companies collect but never use. It often makes up...

https://tango-wiki.win/index.php/How_Much_of_Enterprise_Data_Is_Usually_Inactive%3F

Dark data is the information companies collect but never use. It often makes up 60-80% of all stored data, sitting untouched and costing organizations money. This inactive data can waste up to $2.5 million a year in storage and management expenses