Possible but... There is a folder on the internal drive called "Registration" and underneath that are four more folders named "Bank1", "Bank2", "Bank3, and "Bank4". When you create and save a registration, it is stored in whichever bank folder you select with the name you select for that registration. When you touch the registration button, it displays that folder structure, and you select whatever registration you would like to use.

You can copy any of the files or folders from the primary registration folder(s) over to a second SSD or an external USB drive connected to your device should you want to keep a second copy or re-use the first 4096 registration locations for a new collection of registrations but you can only access the first 4096 registrations located on the primary internal drive at any given time.