Dark data is the information companies collect but never use—often 60-80% of...

https://telegra.ph/What-Are-Common-Examples-of-Dark-Data-in-IT-Departments-07-31

Dark data is the information companies collect but never use—often 60-80% of all stored data. It takes up space, slows systems, and can cost over $2.5 million a year in wasted storage and management expenses