Dark data is the inactive or unused information that sits in your systems—often...

https://holdenlvxt779.theburnward.com/what-is-a-smart-data-migration-and-when-should-we-do-it

Dark data is the inactive or unused information that sits in your systems—often making up 60-80% of stored data. It increases storage and backup costs and raises ransomware and breach risks because it’s harder to monitor and protect