merging built pyramix pc with optical madi interface, clocked from video..
reliable: yes, as long as you know what you're doing.. have recorded 8 1/2 hours straight no prob.. 64 channels to single sata drive no prob too..
back up is whatever is available.. pc with rme madi card and reaper, tascam DA machines, if multitrack is not required by client (but rest assured, they will want the multitracks anyway

, no back up.. Have personally never needed the back up.. knock on wood..
huub