Dark data is the information your organization collects but never uses—often...

https://www.romeo-bookmarks.win/dark-data-is-the-information-organizations-collect-but-don-t-use-often-making

Dark data is the information your organization collects but never uses—often making up 55% of stored data. This unused data not only wastes money on storage and backup but also increases risk by providing potential entry points for ransomware attacks