Dark data is the 55% of stored information that sits unused but still costs...

https://www.bookmarking-jet.win/dark-data-is-the-information-your-company-collects-but-never-uses-often-making

Dark data is the 55% of stored information that sits unused but still costs money to keep and backup. It can increase your risk of ransomware attacks since unmonitored data is an easy target