"43% of people lose irreplaceable files every year"
Updated as of March 2011: Mozy.com is one of the most popular online backup services for individuals. The main reason is due to it's low price point (now $5.99 a month for 50GB of storage). They recently changed their pricing and no longer allow for unlimited storage. In addition to the 50GB plan, they also offer 125GB for $9.99 a month.