We're actually working on an automated backup. But it's not done yet, so you'll have to have some linux skills to do it by hand.
First you need to backup all the databases:
mysqldump --quote-names --allow-keywords --add-drop-table --all-databases > /home/databasebackup
also backup the /usr/pluto/orbiter directory. I *think* that's all.
Now reinstall, using the kick-start cd and *the same device/activation code*, being sure not to wipe out /home. When you're done, restore the /usr/pluto/orbiter and run this to restore the databases:
mysql < /home/databasebackup