I’m doing a piece for InformIT on online backup solutions. I already have a fair number of ‘standard’ online backup solutions, including:

Xdrive: http://www.xdrive.com/
Omnidrive: http://www.omnidrive.com/
Allmydata: http://www.allmydata.com/
Box.net: http://www.box.net/
Streamload: http://www.streamload.com/
Connected: http://www.connected.com/
Carbonite: http://www.carbonite.com/

Each of these is good for different reasons. However, I also wanted to take a look at highly specialized online backup solutions. For example, I use Gmail to backup all my email (the server forwards all mail there whenever it receives it). This is great when I’m on the go and need to find mail. I, literally, use it 3-5 times a day.

Likewise, I use Flickr to backup photos. Sure, I use it to show it to friends and such, but mainly it’s so that I never lose them.

What other highly specialized solutions out there are there that folk use? Plaxo / LinkedIn for contacts? What else?