Dark data is the information your company collects but never uses—like old...

https://emilioezho292.theglensecret.com/how-do-i-estimate-the-cost-of-dark-data-storage

Dark data is the information your company collects but never uses—like old files or unused backups. It matters because up to 55% of stored data is dark, leading to wasted storage costs and hidden security risks