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There is a lot of Linux NAS, open source software, out there which allows you to make one with a "garbage" PC. Essentially for free if you can get your hands on an old PC and a couple of drives. Example of 10 here

I'd just recommend that whichever way you go, at least two drives, at least RAID1, with the capability to hot swap. So ... if one of my drive fails, pull the drive out, replace with a new disk drive. The NAS should recognize the new drive and automagically start rebuilding the mirror/stripe.

NOTE: I have two. One is LaCie brand and the other is Synology. In my opinion, they are both great and for my purposes, neither one is any better than the other.

I will have a look into it, thank you :)