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Do you need to run it mirrored?
With my NAS (albeit a chunk bigger than yours) which is mainly TV shows/films/music I've taken the view that if needs be I can download the vast majority of it again if needs be. I run a script to list out all the files and back that up to the cloud so I'll know what I've lost and personal stuff (which isn't that big) gets backed up to the cloud and elsewhere.
The last few drives I put in were a shucked 8TB drive from a USB HDD (considerably cheaper than a standalone one) and a certified refurbished helium 12TB drive that cost under £100.
If that hasn't convinced you and performance isn't too important then I have a HP Microserver N40l to give away.
aggi-
Yeah, at this point I'm thinking along similar lines. Stop running it mirrored, and back up the relatively small capacity of personal files backed up using cloud storage as well as some offline disk storage.
I did also just discover that Synology & QNAP also sell NAS Expansion devices, which seems like a pretty handy thing to have. Though I haven't done the working out, so maybe buying a bunch of new drives twice the capacity of your current setup is better value than an Expansion device + new drives at your current drive capacity.
mmccarthy
I've currently got a 2-bay NAS at home for file backups and my kid's TV shows/films. It's currently running with mirrored drives and getting low on space.
Upgrading to larger drives seems like a relatively costly option, and I can see a few decent 4x4TB options second-hand for £300-400 (I could get 2x8TB drives for my existing NAS for a similar price). And of course the 4x4TB option will yield greater storage capacity than the 2X8TB option.
Seems like a slam dunk for buying a 4-bay NAS right?