I will be flying out to the other servers location soon and will have access to both booth drives while making the swap.
If I understand what you saying, I would have to purchase two additional USB drives and then restore from backups. Which still makes thing a little difficult cause both servers have different configurations, plugins, shares, etc. I'm assuming the UUID information for the USB drive is stored in the .key file, no? If that is the case is it not easier to just swap everything over from the config folder on both drives, except for the .key file? This way it retains the configuration of everything.