so what's the best way to STORE data: *reliability factor*

[S-Type]

You would should look into a raid configuration.

Usually the best option is an entry level SAN or a "good" NAS, of course, you could even build one on the cheap with I suppose with enough research, Tape would make a good addition to all that realtime backup for offline storage incase of corruption eg from some kinda raging evil virus.

Try that for the price, availability and reliability.