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.