Thanks to upgrades, I have two big hard disks I'm not really using for much. So I've gotten quite interested in
Drobo (the most basic video is the one at the bottom, oddly). It's a box holding several hard disks, and "spreads around" the data on them for safety, but looks like just one volume to your computer. (It's platform-agnostic.)
It's like
RAID, except much simpler, for example you can use any ol' disks you have lying around, they don't all have to be identical.
It's a once a solution to capacity and worry about disk failure. If one of the disks fail, you just pop in a new one, there are no data lost.
[Update: Some of the comments to this post paints a less rosy picture.]
An off-site backup, in case of theft, flood, or fire, is still a good idea, of course.
TidBITS recommends it. And not that that's important, but it's a very pretty box also, methinks. It comes in various flavors and sizes, but I think the basic four-slot model (named Drobo simply) is fine for most people.
Update: Ooh, one of the
videos even has an MTV-like-perky cute girl presenting. Like really cute. She must be an actress/presenter rather than an employee. (Stay for the outtakes at the end.) ... Aha, she's called
Cali Lewis. A missing link of cuteness and geekiness. (Funny thing, she seems totally different in the second video.)
Cali hosts an interesting vid podcast, Geekbrief. This is the
HD version.