Best and safest way is to build a small Raid 6 server if you need redundancy and seed then just setup sharing but can be a little more costly and depends on what all u need. Or if you just want storage and nothing else something like
http://www.lacie.com/us/products/product.htm?id=10313 in a Raid 5+ spare or raid 10.
Mostly all comes down to how much you want to spend. No matter what you buy, if you need 5tb make sure you have for future expansion.