Dark data is the information organizations collect but don’t use, making up 55%...

https://www.bookmark-fuel.win/dark-data-is-the-inactive-or-unused-information-that-piles-up-in-your

Dark data is the information organizations collect but don’t use, making up 55% of stored data on average. This unused data increases storage and backup costs and raises the risk of ransomware or data breaches