Is a disk cloning device where you plug in a box to a USB slot

Sure, with the provision that the computer is in a particular configuration which allows that to happen.

>>58361797
What program would it use?

Almost all the drive cloning software I've seen requires you to boot into a linux distro.

>>58361775
partition manager

I'm fairly sure HDD docking stations with multiple slots exist that clone a disk contents to another without even being connected to a computer. Even chink ones like orico iirc.

>>58361826
>What program would it use?
You don't need a special program, just write a script

#!/bin/sh
dev=/dev/sdb

while true; do
    while ! [ -f $dev ]; do sleep 1; done
    dd if=$dev of="$(date).img"
    beep
    while [ -f $dev ]; do sleep 1; done
done

This script will work on: Linux distros, macos, *BSD, Android, most POSIX or UNIX compatibile systems.

It will not work on: Windows, iOS