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

https://wiki-saloon.win/index.php/How_Do_I_Keep_an_Audit_Trail_When_Moving_or_Deleting_Old_Files%3F

Dark data is the information your company collects but never uses—often making up 55% of stored data. This unused data not only wastes storage and backup costs but also increases risk, like ransomware targets hidden in forgotten files