For backups, I think the problem is related to the PlayLoad, in that video we clearly see the error message made by MM in the begining, it couldn't load the wanted BDEMU, that's why the PS3 crashed !!
I remember that they said that the JFW will be able to load games without using a backup manager wich is not the case here, I hope there will be updates to fix this or that the 3.41 version would be better !!!
Honestly, I prefer top wait that the team over the reverse engineering of the True Blue dongle made her magic & make us a usable playload or CFW with TB functions !!
Also, I don't think that Deank make an update for his MultiMAN over the JFW MA 3.56, he & DemonHades are not good fiends !!