Dark data is the information companies store but never use, often making up...

https://cesarsuniquenews.theburnward.com/why-do-backup-costs-explode-when-you-keep-old-files

Dark data is the information companies store but never use, often making up 60-80% of their data. This inactive data takes up space and costs money—sometimes costing businesses up to $2.5 million a year in wasted storage and management