Dark data is the information companies collect but never use, often making up...

https://www.bookmark-maker.win/dark-data-is-the-55-of-stored-information-companies-don-t-use-but-still-pay-to

Dark data is the information companies collect but never use, often making up 60-80% of all stored data. This unused data takes up space, slows systems, and can cost businesses millions yearly in storage and management