Directly convert archbang live on a USB drive to one such with persistence file system

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http://unix.stackexchange.com – I have installed Archbang 2012.12 on my USB drive, now I have a USB drive with a live linux installed on it but at end of every seesion and rebooting system I faced with a fresh arch installation and nothing will be saved. I'm looking for a solution to convert my live system to an Archbang installed on my USB drive with persistnce filesystem which save every changes. I have to mention I would not to install it to a new USB drive, just converting. (HowTos)