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

https://wiki-byte.win/index.php/How_Much_Enterprise_Data_Is_Usually_Inactive%3F_Understanding_the_60-80%25_Inactive_File_Data_Percentage

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