Backup is easy to do, but don't use dd. You have three options: - use 0xFFFF and save the image to the internal mmc ("0xFFFF -e /media/mmc1/backup"), then transfer the image to your pc. That image would be flashable. - make a flashable image with mtdtools (see http://talk.maemo.org/showpost.php?p=223846&postcount=2). You can save the image to the internal mmc, a network share or pipe it directly through netcat to your pc. - mount --bind / under /mnt, then backup with tar. You can save the tar.gz file in the internal mmc, a network share, or pipe it directly through netcat to your pc. You can make a jffs2 flashable image in your pc then (see previous method), or boot a ext2/3 image from usb to be able to restore it.