QUOTE (DARK_SABER @ Jan 25 2010, 10:19 PM)

Id recomend you build a cheap PC (basic equipment such as a plain case, mobo, avg cpu and cooling system, etc) and get a pair (or more) of high quality, high capacity hard drives. Get a program that will automatticlly back up your choosen files to this computer (usually you can find one on the web for free or cheap) and you will at least have a degree of redundency. If you buy smart you can build it for around 500 bones (IE newegg is your friend for something like this). All that you would have to do is just keep it on the family network via a router and can access it from any other computer in your house.
$500? That's expensive for a fileserver, unless you've filled it with $350~450 worth of (SAS/SATA) TB HDDs. You don't need new hardware for a fileserver, buying used (server) hardware is cheaper and usually far more effective (You get HDDs with the hardware).
Be sure to run a fileserver in RAID5/6 if you have the hardware to do it (Get a hardware RAID card instead of software RAID, saves CPU cycles).
Don't run windows on a fileserver, it takes took much space and gives you too little control over your system. Linux takes up less space and you have far better control, plus thousand of tutorials explaining how to set-up fileservers.