Dark data is the information your company collects but never uses—think of it...

https://fernandowehn083.timeforchangecounselling.com/how-do-i-find-dark-data-on-a-nas-without-breaking-anything

Dark data is the information your company collects but never uses—think of it as digital clutter. Around 60-80% of data sits inactive, taking up space and costing businesses up to $2.5 million each year in storage and management