Update: See our Top 5 Free Online Storage Reviews (11/1/2010) for more cloud storage goodness.
I’ve been in search of truly unlimited online storage for quite some time. I don’t mind paying, as long as it’s really unlimited. In my quest, I’ve come across a wide variety of services that fall short of their claims because they require the use of a proprietary client to facilitate the backups, thereby effectively making an online RAID 1 mirror. The catch is that if you delete something on your local machine, it will be deleted (typically within thirty days). So, they’re obviously not too worried about you using too much space since it is unlikely that you’ll have 100TB of data on your machines.