Mozy
Description from Wikipedia
Mozy is an online backup tool created by Berkeley Data Systems, a Silicon Slopes company based in Pleasant Grove, Utah. The Mozy online backup service allows both Windows and Mac users to back up their data to an off-site server. While originally released as a product for end-users, Mozy later released a remote backup utility for businesses called MozyPro.
Mozy currently offers three versions of backup software: MozyFree, MozyHome and MozyPro.
Mozy Free allows users to back up as much as 2 GB of data from up to two computers (referring others to Mozy gives free users an additional 0.25 GB of storage space). MozyHome Unlimited allows unlimited backups from one computer. MozyPro is the business class version of the Mozy backup software.
Mozy has the ability to back up several types of files such as bookmarks, documents, and e-mails at once rather than forcing the user to select particular files or folders. Mozy also has the ability to back up locked files, such as the Outlook.pst file. This allows backup of files that are in use, offering users near-continuous protection against data loss.