RAID1 is for drive redundancy - not for backup. Though it can seem confusingly similar. Folks who put important data on their EX2s should also backup their EX2 data somewhere else. If the enclosure fails, RAID formatted drives won’t be readable by another device…the software RAID controller is proprietary. Only if you have another EX2 shell, you can be assured that if you put the disks in the same order in that shell, that they’ll work fine. But the chances of drive enclosure faling is very small compared to the inevitability of an HDD failure because HDDs have moving parts, while the enclosure does not. Sure, there is a PCB inside and all electronic boards slowly degrade over time, esp. capacitors, but their rate of degradation is much slower. But if that is your concern, you can always buy a diskless EX2 to future-proof yourself from that very small probability 
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