It should.
Plug in the USB drive. See where it mounts, usually /media/something. You can cat /etc/mtab to get the device info also, just look for something being mounted to /media/something.
Make a directory for the server image under /images, something like /images/Server1.
Mount the device to the folder you just created: sudo mount /dev/usbhdd1 /images/Server1
See if it works. If so, you can add it to the fstab so it mounts the folder on every boot up. You may also need to use the same usb port each time, but I’m not sure how Linux ID’s the external drive for mounting purposes.