Question about WD My Book Duo

According to the user manual, the software supports Raid0, Raid1 and JBOD, so yes.

I have read several posts on the net that want an access option or require the encryption key from WD, but this has apparently not yet been made available. It is therefore not possible to access the hardware-encrypted data on the individual disks oneself - via key - if one wants to do so in the event of a hardware failure of the controller. WD has not yet come up with a solution.