Dark data is the information companies collect but never use, often sitting...

https://juliet-wiki.win/index.php/Why_Is_Our_Backup_Taking_Longer_Every_Month%3F_Unpacking_the_Impact_of_Data_Sprawl_and_Dark_Data

Dark data is the information companies collect but never use, often sitting idle on servers. Around 55% of organizational data is dark, meaning it just takes up space, costs money, and can create risks