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

https://www.active-bookmarks.win/dark-data-is-the-information-your-organization-collects-but-never-uses-often

Dark data is the information companies collect but never use, often making up 60 to 80% of all stored data. This inactive data takes up space and costs money—on average, businesses waste $2.5 million yearly just storing it