I'd like to keep it up to date, so just a harddrive is inadequate, since all my trusted friends and relatives are 3 hours away. I'd need a whole computer, on 24

I'd like to keep it up to date, so just a harddrive is inadequate, since all my trusted friends and relatives are 3 hours away. I'd need a whole computer, on 24/7 with some ports forwarded and stuff. I don't want to impose the... 8 or 10 bucks extra electricity per month a 24/7 comp uses. (Also, there's the nice side benefit of having a webserver to host my random forays into web design, personal blog, etc.)