Dark data is the information your company collects but never uses—often 60-80%...

https://www.a1bookmarks.win/dark-data-is-the-information-companies-collect-but-never-use-often-making-up

Dark data is the information your company collects but never uses—often 60-80% of all stored data. This unused data takes up space, costs money to manage, and can hide security risks