Does "pc independant" mean not-using-pc-hardware or does it mean not-in-a-desktop-box? Reason being you should really take a long, hard look at Windows Home Server or, if you don't like that, maybe Amahi for the OSS (next best but falls very short in one critical area) alternative. And I say WHS because, marketing crap aside, from what I've read you can:
- start with what you've got now
- at some stage later toss in a bigger drive
- at some stage later still, toss in even bigger drive
- at any stage rotate smaller drives out as you put bigger drives in
- ...IOW, it basically replicates Drobo's party trick (without the *punishing* cost!)
On top of that you can do full restore-from-dead (with accompanying boot cd) backups your local (id est LAN) machines. And then, just to make it even more fun, there's a fairly thriving add-on community that extends its functionality in all sorts of interesting ways.
Do this right and you'll end up with something that comes with much the same power cost as a branded NAS but for
- a LOT less upfront and ongoing layout
- way more flexibility
- ...basically better value for money.
Well, I think so at any rate; naysayers are welcome to shoot my case full of holes!