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

https://www.foxtrot-bookmarks.win/dark-data-is-the-stuff-companies-store-but-rarely-use-think-old-emails-logs

Dark data is all the information companies collect but never use—like old files and logs. It makes up 60-80% of stored data and can cost businesses up to $2.5 million a year just to keep