external storage; auxiliary storage
Computing term for storage devices outside the main memory, such as hard disks, SSDs, USB drives, and cloud storage.
I use an external hard disk as an external storage device.
データは外部記憶にバックアップしておいてください。
Please back up the data to external storage.
external storage device
Compound of 外部 (external) and 記憶 (storage/memory), a straightforward technical term.