Dm800 Backup your image

install plugh enigma2-plugin-extensions-dflash_3.3_mipsel.ipk

u r easily bacup openpli,merlin3,gp3 ,Newnigma2

for openaff and open atv image use dflash atv mood plugh

for black hole use
USB backup script from addon and
Now with your USB stick formatted to fat32 and connected to one of the rear usb ports press the Green then Blue button and highlight USB Backup and then press OK.

Your backup will start.

for multiboot image use
use enigma2-plugin-extensions-tsflashbackup_84b-2_mipsel.ipk plugh