It's hard enough archiving my own stuff MP3/FLAC tagging and the hassles I read people having with big collections have put me off music stored locally.
Stuff like music collections I leave to pandora, spotify and the like. My music backup is sample libraries all overdub and test takes, not to mention hours of noodlng and whole session recordings. As a DAS it is still shared over the Gigabit network so becomes a fast NAS for serving up any saved content. even when hanging two displays off of the thing it's faster than most external USB drives and works as an external boot drive for occasional projects, time machine backup (I duplicate the entire time capsule once a day). When reconsidering NAS options for the studio (been there with Thecus and Qnap) I steered clear of Ethernet and went for a Promise Pegasus 12TB Thunderbolt DAS solution, priciest option, but the fastest. The problem is not the NAS but the pisspoor interface speeds, even with gigabit Ethernet the processors inside many domestic NAS units are just so slow that drag theoretically at worse 100mbp/s transfers over ethernet down to 30-50mbp/s. I also have another off-site backup, so it doesn't worry me when I trash one of the backups for a complete rebuild. Occasionally (several times per year) I totally wipe the destination NAS and do a complete backup as that ensures every file is read (from the source NAS) and re-written to the destination (so the disk FW in the source NAS can identify and correct - i.e. I now use another NAS as my on-site backup of my main NAS (it's located in a different part of the house) and I the rsync protocol to back up changes. The good thing is that you'll now have your old NAS as your backup, so that's a good place to be (I'd not sleep well without backups).
From memory, writing back to something like an old NV+ or Duo (or D-Link DNS-323) took more like 50 hours per TB. When I'm copying between two modern NAS units (over a GigE switch) it probably takes about 12 hours per TB, so it's not that slow. The limiting factor will be the NV+ as that's quite a slow unit (though it isn't so bad when reading from it).
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