OK i have 2 PS3's one on 4.21 Rebug Rex and the other on 4.31 OFW. and i have a legit Disk. and my region settings are set to what ever default Oceania i think. as long i don't upload my back up copy any were can't i just

off my copy to multiman and just use BD Mirror With GameDisk? and then use the Disk with my 4.31 OFW? - this is all for online.
And why use Internal instead if GameDisk? and why use standard emulation instead of Hermis/other 1?