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Android based NAS sounds wrong... but building it using usb2.0 storage
sounds even worse... to me at least.
I have a 2 disk sata/usb raid1/0 cabinet, this could work with the cubie. Thecus makes the one I have, but I'm sure the controller inside it is available on its own too. It handles the raid on its own, the host system just sees a single sata disk.