Option 1.
Full backup

Making a Backup of every setting on the dreambox (incl. firmware)

telnet to the box and write the following command after loggin in:

cat /dev/mtd/3 > /var/tmp/backup.img

you can download this image to your pc, so you can always switch back to this backup image.


how to switch back:
first ftp the file to the dreambox in /var/tmp/
then telnet to the box and use following commands:

cd /var/tmp
eraseall /dev/mtd/3 && cp backup.img /dev/mtd/3
reboot


Option 2
Partial backup

good directories to backup

/var/keys
/var/scce
/var/tuxbox/config/enigma

usally good too

/var/etc

good files to backup

/var/tuxbox/config/satellites.xml

and if you like me and like to change anything I can...

/var/tuxbox/start_enigma

Enjoy!