How to Backup your firmware of Openwrt Device?

backup u-boot:

cat /dev/mtd0 > /tmp/backup_u-boot.bin

backup art:

cat /dev/mtd4 > /tmp/backup_art.bin

buckup firmware with your settings:

cat /dev/mtd5 > /tmp/backup_firmware.bin

Note:
This firmware you can flash through the Web interface or the MTD method!

buckup fullflash:

cat /dev/mtd0 > /tmp/backup_fullflash.bin
cat /dev/mtd5 >> /tmp/backup_fullflash.bin
cat /dev/mtd4 >> /tmp/backup_fullflash.bin

then copy bin file from tmp dir on router in your computer via WinSCP.