Dark data is the information your company collects but never uses, often making...

https://reidyxab469.iamarrows.com/what-are-egress-costs-and-why-do-they-matter-for-dark-data

Dark data is the information your company collects but never uses, often making up 55% of stored data. This inactive data increases storage and backup costs and raises the risk of ransomware or data breaches