shadow copies for off site disk

This is not a good backup plan. One reason is that the SATA connectors on your hard drive are not intended for that many insertions/removals.

So my suggestion is to buy a USB drive for backup (or pick up a second NAS and use frontview backup).

Nhellie wrote:
The disks need to be on the same bay where it was originally synched or else it will be reformatted by the NAS. My suggestion would be to remove disk 2, shadow clone disk 1. Once done, remove disk 1 shadow clone disk 2. Now, you will have 2 shadow disk for bays 1 and 2. Or get another unit and setup readynas replicate.

- Replicate is included in OS6, but requires a license with the duo. For a while, cap1 was providing free replicate licenses in some cases - but he as since left Netgear...

-The duo v1 uses a different format for the "parity" disk (usually drive 2). Inserting a new disk 2 into the NAS will create a new disk 2 (which is not a clone of disk 1). Similarly for disk 1.

-If you were to insert an archived disk into an empty NAS, it should boot no matter which slot you inserted it into(it shouldn't need to be in the original slot).