Dallas Police Department (DPD) « The migration, which took place between 31 March 2021 and 5 April 2021, actually destroyed 22TB of data. 14TB were recovered, presumably from backups, but « approximately 8 Terabytes remain missing and are believed to be unrecoverable. »

https://www.theregister.com/2021/08/16/dallas_data_migration_8tb_deletion/