How can any enterprise only rely on such online services and not keep copies of their job on their own storage ? At least store in large TB hard disks connecte

How can any enterprise only rely on such online services and not keep copies of their job on their own storage ? At least store in large TB hard disks connected with a SATA adapter when needed, and put them in a case in a safe place (better: two copies, stored in two places). What is the HD + copy time price relatively to production work ?