Yamaha DX7 II FD Supplemental Booklet page 52

Creating Backup Disks
Although the disks used in the DX7
duplicate valuable data as a
You may want to keep backup disks in a safe place (away from the original), and use them
only if the original becomes damaged or lost. It is also recommended that when using a
backup disk, you switch the backup disk's memory protect on before using the disk.
To backup an original disk, you must first format a duplicate disk. This is done from the
same display as the "Back up" function. Insert the disk, and follow the directions in the
LCD.
Format a blank disk. Locate a 3.5" disk that you wish to back up (duplicate). Then. ..
are very reliable, you may wish to "backup" or
II
FD
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recaution against accidental disk eras ure.
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