Dark data is the inactive info your company stores but doesn’t use—often 60-80%...

https://www.booknose.win/dark-data-is-the-inactive-or-unused-information-your-company-stores-but-doesn-t-1

Dark data is the inactive info your company stores but doesn’t use—often 60-80% of all data. It increases risks like ransomware exposure since old files may lack proper security