Dark data refers to the inactive or unused data that companies keep but don’t...

https://www.random-bookmarks.win/dark-data-is-the-inactive-or-unused-information-that-builds-up-in-your

Dark data refers to the inactive or unused data that companies keep but don’t analyze—often around 60-80% of stored data. This not only wastes storage and backup resources but also increases risks like ransomware attacks