and need to copy the data somewhere so you can create the newer, bigger RAID volume.
That's why I was thinking of the Synology system because, if I'm reading it right, I can add drives to the system to increase the overall size without need to copy the data anywhere. So if, for example, I started out with the 5-bay system, I could add the 5-bay expansion and get more space without having to copy everything off it.
This is true. But you could also replace the disks with larger disks one by one and let the array rebuild. Works just as well and is a lot cheaper. Unless you absolutely need 10 disks in your array of course - which would automatically be two volumes, see my earlier comment about that.
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