Upgrading Storage in Netgear ReadyNAS102

I have a Netgear  ReadyNAS 102 storage drive.
I have 2 X 1TB drives in there at the moment mirrored.

If I want to upgrade it to 2TB of Storage, so I need to backup the whole system to another device, then uninstall both drives and install 2 X 2TB drives, then copy the data over again, or is there an easier way of doing it?

I am kind of hoping someone will say I can just replace one at a time and it will setup the mirroring itself!!
mbellettyAsked:
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PerarduaadastraCommented:
If you have an X-RAID2 volume in your ReadyNAS then it seems that your wish is granted...

You can replace one 1TB drive at a time with a 2TB one, let the drives synchronise, then replace the remaining 1TB drive with the second 2TB drive, and let that synchronise with the first 2TB drive installed. Netgear call this vertical expansion, as opposed to horizontal expansion, which is adding more disks to an existing array.

The process is detailed on page 33 of this manual:

http://www.downloads.netgear.com/files/GDC/READYNAS-100/ReadyNAS%20OS6.1%20SW%20UM16Oct2013.pdf

However, the same page tells you to back up your data before vertically expanding the array, which I'm sure you were going to do anyway...
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