how to make full image backup

Hope this will help you:-

BH Images have the Backup function pre-installed.
All you need is a usb stick formatted and mounted.
To make a full backup press Menu, goto Backup Menu and press OK.
Choose Blackhole Full Backup and press OK.
On the Window that comes up, just choose media/usb.
Press Red button and the backup process will start.
Wait a few minutes until complete.
When ready, on your PC, using an FTP editor, goto /media/usb and transfer the vuplus folder (which contains all the image backup files) onto your PC for safe keeping, should you require to use your backup in future.

It couldn't be the real blackhole image if it's for the miraclebox bud, it must be a modded version..... Blackhole team only make images for VU+ receivers.

You could try using the plugin BackupSuite install it as a ipk. It will do the same job.