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

https://www.charliebookmarks.win/dark-data-is-the-inactive-or-unused-information-organizations-keep-but-don-t

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