This article illustrates how to do a backup of your FOX Board G20 bootable microSD using an Ubuntu Linux PC. Unfortunately I didn't find an easy way to do a copy using Windows because FOX uses an ext filesystems unsupported by Windows. In this case you could use a virtual machine using SunVirtual Box.
Turn off your FOX typing:
debarm:~# halt
Insert the original microSD in your Linux PC. Two new folders will appear on your desktop:
Partition and format a new microSD following the instruction on this article: Partition & Format a bootable microSD.
Remove the target microSD and insert it again. Two new folders will appear on your desktop:
Open a terminal session on your PC and type:
$ sudo cp -rp /media/kernel/. /media/kernel_/. $ sudo cp -rp /media/rootfs/. /media/rootfs_/. $ sync $ sudo umount /media/kernel_ $ sudo umount /media/rootfs_
Your copy is ready, extract it and try on the FOX.