Dark data is the information companies collect but never use. It’s estimated...

https://noon-wiki.win/index.php/Is_Dark_Data_Mostly_a_People_Problem_or_a_Tooling_Problem%3F

Dark data is the information companies collect but never use. It’s estimated that 60-80% of stored data sits inactive, costing organizations up to $2.5 million every year in storage and management