Dark data is all the info your company collects but never uses—think emails,...

https://star-wiki.win/index.php/How_Do_I_Stop_Dark_Data_From_Coming_Back_After_Cleanup%3F

Dark data is all the info your company collects but never uses—think emails, logs, or old files. Surprisingly, 60-80% of data sits inactive, costing businesses up to $2.5 million a year in storage and missed opportunities