Dark data is all the information companies collect but never use, like old...

https://www.bookmark-maker.win/dark-data-is-the-information-companies-collect-but-never-use-it-can-make-up

Dark data is all the information companies collect but never use, like old files or unseen logs. It's huge—up to 80% of stored data can go untouched. That’s a big deal because managing this forgotten data can waste around $2.5 million each year