Dark data is the info your company collects but never uses—think old files,...

https://wiki-legion.win/index.php/How_Do_I_Keep_Drafts_and_Duplicates_Out_of_a_Vector_Database%3F

Dark data is the info your company collects but never uses—think old files, forgotten logs, or unused reports. It can make up 55% of your stored data, tying up space and costing you money