Dark data is the inactive information companies hold but don’t use—often 60-80%...

https://www.bookmarking-online.win/dark-data-is-the-55-of-stored-information-that-companies-collect-but-never

Dark data is the inactive information companies hold but don’t use—often 60-80% of their stored data. This hidden data can silently eat up storage costs and even lead to $2.5 million wasted annually in inefficient management