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Something like this:

   sudo fdisk -l</code>

Take note of how the SD card is identified. In my case it is /dev/sdb1. Then:

   sudo dd bs=4M if=/dev/sdb | gzip > /home/your_username/image`date +%d%m%y`.gz

This will compress the image using gzip. To restore the backup on SD card:

   sudo gzip -dc /home/your_username/image.gz | dd bs=4M of=/dev/sdb

All this must be done on a linux PC. It won't work on the raspi!