I have been using Mozy Free for a few months now and I’m VERY happy with it. It is set it and forget it (which when it comes to backup is HUGE).
Recently Mozy updated the solution to a $5/month for home users which allows “unlimited backup” for home users. The free version has a 2gb limit (which i have not come close to yet, but i’m only backing up data, no photos or music).
As i’ve said before, the best part of this system is the ability to set up and forget this backup system. when i had a problem with my system a few months ago and i THOUGHT i backed everything up and then rebuilt my machine, i forgot some key items (like my address book). I reinstalled mozy free, and did a restore off the internet. PERFECT!
If you are looking for a quick and easy solution for online backups, check out mozy!