Dirty-backup clone your n900 maemo system via an usb linux machine
 

backup/restore your personal u-boot-2013.04-2 maemo system (rootfs emmc and sd) via commandline via usb networking via rescueos booted by 0xffff

install u-boot-2013.04-2 kernel via commandline

two scripts: Makefile for "automatic" backup, dirtyClone.sh for "manual" clone
further information in the scripts

https://ufile.io/nmb94

for sure contains bugs!