Backup of Cloud Home Duo by exchanging disks?

Hi guys,
after searching through the posts I did not find an appropriate answer (or it was unclear to me).
I would like to periodically backup my Home Duo by exchanging one disk in a round-robin manner.
2 Disks in Duo, 1 spare disk locked away.
Then put spare disk into Duo, have the RAID rebuild (so effectively I now would end up with 3 disks and the same data on it) and lock away 1 disk.
Then, repeat this procedure every X months.

Would that work? Any pitfalls to consider?

Thx and best regards,


P.S. I found which describes the “real doing” of exchanging a disk. But still the question is, if the RAID would be correctly rebuilt to cover my “backup needs”.