Dark data is the information your company collects but never uses, often making...

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 information your company collects but never uses, often making up 55% of stored data. This inactive data increases storage and backup costs and raises the risk of ransomware or data breaches