EP9302 Restore CF
If backing up on a separate workstation, keep in mind windows does not have direct block device support needed to write these images. You will also need to determine the CF card device. You can usually find this in the output of 'dmesg' after inserting the CF card and you will typically see something like '/dev/sdb' as the block device and '/dev/sdb1' for the first partition. On some newer kernels you will see '/dev/mmcblk0' as the block device and '/dev/mmcblkop1' for the first partition. For these examples I will use the '/dev/mmcblk0' format.
If you are backing up directly on the board you will likely need to use some kind of offboard storage like a thumbdrive or external hard drive.
You can find the latest CF card image here which will contain the Debian OS. Make sure you decompress the image before writing.
Backup
Entire SD card
dd if=/dev/mmcblk0 of=/path/to/backup.dd bs=32k
Kernel
dd if=/dev/mmcblk0p2 of=/path/to/zImage bs=32k
Initrd
dd if=/dev/mmcblk0p3 of=/path/to/initrd bs=32k
Restore
Entire SD card
dd if=/path/to/backup.dd of=/dev/mmcblk0 bs=32k
Kernel
dd if=/path/to/zImage bs=32k of=/dev/mmcblk0p2
Initrd
dd if=/initrd bs=32k of=/dev/mmcblk0p3