How to upgrade current storage of 1 x MIRROR | 2 wide

I currently have 2x 4TB disks, 4TB total storage. What is the best way to increase storage? I don’t really want to use more than 2 disks in total.
Can I just replace one of the 4TB disks with an 8TB drive, let it rebuild and then replace the remaining 4TB with an 8TB?

Sure can. The manual explains how. You could also add another pair of disks mirrored, but that wouldn’t be the best option if you don’t want more than 2 disks.

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