Dark data is all the information your company collects but never uses. It often...

https://city-wiki.win/index.php/What_Kind_of_Sensitive_Data_Hides_in_Old_Shares%3F

Dark data is all the information your company collects but never uses. It often makes up 60-80% of your stored data. This hidden data wastes storage space and can cost businesses up to $2.5 million a year in unnecessary expenses