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The gist is that you can incrementally buy disks, plug them in, and their RAID controller does all the work.


This is one big reason I want to get a decent hardware RAID controller one day for my server. I much prefer a hardware card that says "capacity expansion" as a feature with a minor footnote about backups, compared to the Linux RAID warnings of "it is very likely that there are serious bugs that will destroy your data, possibly even on disks not related directly to the array you are re-configuring."

More info on that NAS box is here, including some interesting shots of the internals.