There is some options:
ZMESerialUpdater from Downloads :
ZMESerialUpdater serialapi_ripnvm -d $serport $backupfile
ZMESerialUpdater serialapi_restorenvm -d $serport $backupfile
But it will not work if the firmware is too old on the backup stick and the firmware on the restore stick is new(ish).
and the Aeotec backup utility for Windos.
(I briefly tested backup/restore on a UZB1)
The Aeotec tool did not give me a good feeling like a proper tool should.
There is also the possibility to upgrade the firmware.
I do not know what will happen with the NWM if the firmware is upgraded..
Take care, the stick may fail! One of my UZB1 died when I tested firmware upgrade.