I do frequent Acronis Disk Image backups of my system, so that in the event of a disk failure I can restore the computer to the last backup state. I backup to both a 4TB disk in the computer and a NAS connected via the network. I have 6 SSDs arranged in three RAID0 arrays.
I recently upgraded my ME and Bios using the method presented here in post #1
http://rog.asus.com/forum/showthread.php?48855-Must-Do-s-for-making-4790K-work-with-Maximus-VI-Mothe...I thought that after the BIOS Update I'd have to restore the RAID Arrays, but to my surprise after changing the SATA setting in the BIOS to RAID, the three Arrays were immediately visible and usable.
This may not be the case if the USB Flashback method is used, but it was the case for me doing the update via the BIOS Updater.
RodeoGeorge