
I also looked at Amazon s3, http://aws.amazon.com/s3/, very cool stuff, I use it for work, but you paid $0.15 per GB / month. 100GB would cost me 15$ per month plus I would have to paid for the Data Transfer $0.17 per GB transferred... so Mozy definitely beat this...
The last one I looked at was DropBox (http://www.getdropbox.com/pricing) This is more like a share folder that get sync up on the internet. Could be useful if you have multiple computer, that dropbox folder will get replicated between all of your computers that is setup with your DropBox folder... You can't do this with Mozy... Still more expensive, 10$ per months for 50GB
One more thing about Mozy, Mozy charges $4.95 per computer that is running the software, but you are allow to backup mounted drive, so you can mount the drives of all your computers and back them up, the way it work, is if a file is no longer on your computer for over 30 days or if you have not mapped the drive for 30 days, they delete it from the mozy server.
If you find something better, please let me know