As I see you know well what you talk about, try our backup script and ipk that works perfectly with it, define the usb stick as /media/hdd and all should go fine,

Toysoft's
http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=3496#Post3496

or

Fairbird's
http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=1525#Post1525

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