Dark data is the information your business collects but never uses—often 55% of...

https://ace-wiki.win/index.php/What_Should_I_Do_with_Temp_Files_and_Legacy_Exports%3F

Dark data is the information your business collects but never uses—often 55% of all stored data. This unused data can increase your risk of ransomware attacks and drive up storage and backup costs, sometimes wasting $2.5 million a year