Backing up your NAND is done through Hekate, not CFW. You can do this before your SX Pro arrives, using a DIY jig to enter RCM.
AFAIK ChoiDuJourNX doesn't work in SX OS, you have to use one of the other CFWs (ReiNX, RajNX, etc) packs as it, I think, needs Atmosphere.
Also, again AFAIK, SX Pro...