Dark data is the inactive or unused information that makes up around 60-80% of...

https://zaneznae304.lucialpiazzale.com/does-2-5-million-a-year-in-dark-data-waste-sound-realistic

Dark data is the inactive or unused information that makes up around 60-80% of enterprise storage. It often includes sensitive files forgotten over time, increasing risks like ransomware attacks and data breaches