The following steps will guide through backing up mixer settings to a USB drive.
- Insert a USB memory into the USB MEMORY port of the M-300.
 - Press the SYSTEM button.
 - Press F3 (LOAD/SAVE).
 - Press F2 (SAVE).
 - Press F8 (SAVE). 
A “now processing” message will indicate the progress of the operation. When saving is completed, the progress indication will close. 
Note: 
Mixer settings are saved in the “RSS/M-300/PROJ” folder of
the USB memory. All settings except for user settings are saved.