Dark data refers to the 55% of stored information that organizations collect...

https://www.first-bookmarkings.win/dark-data-is-the-dormant-info-businesses-keep-but-don-t-use-often-55-of-all

Dark data refers to the 55% of stored information that organizations collect but never use. This inactive data increases storage and backup costs and raises ransomware and breach risks by expanding attack surfaces. On average, companies waste $2