Swap drives from ReadyNAS Duo V1 to ReadyNAS 102

The Duo is old, but the firmware is up to date apart from the revision that broke PHP5, which I need to run my home grown CCTV setup. I haven't done a factory reset on it since the day I set it up, so it looks like I'll have to add that to the jobs list. I wasn't originally planning to, but it would make sense to move my CCTV onto the 102, possibly as a stepping stone to movinf to ReadyNAS

Looking at your proposed procedure I couldn't see where you could fit in a factory reset on the Duo?

I think what I'm going to do it this:

1) Copy both the data and media shares to my local PC (which just happens to have a nearly empty 1TB disk in it).
2) Put one 2TB drive in the Duo and allow it to become redundant.
3) Put the other 2TB drive in the Duo and allow that to become redundant.
4) Put both 1TB drives in the new 102, reset and allow them to be reformatted.
5) Re create both shares on the 102 and copy the all the data back from the Duo.

Now I will have two NAS with identical copies of the same data, plus the snapshot on my local hard disk.

6) Work with the 102 as the "live data" storage and verify the transfer was successful.
7) Get PHP5 and my extras installed and working on the 102
8 ) Update the firmware and factory reset the Duo
9) Re-create the media share on the Duo
10) Copy the media share from the 102 to the Duo.
11) Verify the media share transfer is OK and delete the copy from the 102.
12) When I'm absolutely happy with everything, delete the backup from the local PC.