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Is RAID1 over USB Reliable?
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this post was submitted on 25 May 2024
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The big factor is the chip make in the USB enclosure/adapter. Realtek is most reliable, followed by Asmedia. JMicron is garbage (will get hot and drop connection).
What's your goal by using RAID1? Do you really need redundancy — keep the system alive if the main drive good down?
If you only need backup then you don't need RAID, and that should fare much better — just take an incremental snapshot to the USB drive periodically and let it sleep the rest of the time.