Hi and yet,
It is not possible to connect two devices as master USB ports together back to back. A master USB port is a PC/Mac/Chromebook/B2/BB1 port and this is the driver port on each of these devices.
A USB slave port is a USB memory stick/USB printer/USB HDD/USB CD drive, etc. You can only have one USB master in any USB single circuit but you can have multiple slave devices.
If you connect two USB masters directly to each other, you run the risk of damaging one or both USB ports. This configuration cannot work.
Therefore you need to plug a USB HDD (the slave) into the first Brennan, do the 'Export', then plug the USB HDD into the second Brennan (again as a slave) and run the 'Import'.
Regards,
Peter.