Dark data is the info companies collect but never use—often 60-80% of all...

https://www.bookmarkpage.win/dark-data-is-the-inactive-or-unused-information-that-piles-up-in-your

Dark data is the info companies collect but never use—often 60-80% of all stored data. It takes up space, slows systems, and can cost businesses $2.5 million a year in unnecessary storage and management