Casio CZ/ VZ/ FZ - Pro Series

Hi all - 

How do one copy the FZ Optional Software floppy? I would like to make a backup of it in case the original disk decides to fail. I tried to copy it with the copy function in the optional software - but after a while a get a disk error, which make me suspect the disk is already starting to give up (although all functions are still working).

/C

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