PSR 3000 regist. backup

[Topman]

Thanks to information on this forum, we have successfully registered a number of Xmas songs in the user program.
We used one reg. number for each song.  We continued registering more songs and labeled them B-1, B-2 etc. (this would be for song 9 and song 10)
After we saved the first 8 songs,  and continued to do 2 more, the screen changed to page 2 giving us up to 10 songs showing on each page.
So assuming this is right, (not sure),  once we are finished registering, how do we save these to a usb and then back to the keyboard.
Any thoughts/help would be very much appreciated.
            Thanks,  Iver