I noticed in 2.1-r5 GUI you can save now the configuration on a USB drive. However the restore tab gives you only options to restore from flash or no restore.
CLI command config-restore gives you the same options.
Tried File trasfer-> file download
Usage is not clear. Ticking startup-config nex to the source file name and rebooting is not giving the results as expected.
In cnMatrix 2.1-r5 save and restore switch configuration using USB drive is supported. Please refer to the USB section in the attached cnMatrix User Guide - CLI_v2.1 document (pages 171-172). Below are CLI commands to save and restore the config:
config terminal
mount usb
exit
copy startup-config usb:switch1.conf <<<< save config to usb
copy usb:switch1.conf startup-config <<<< restore config from usb