SiteShelter Online Backup for Web Sites 

SiteShelter is an automated online backup utility that mirrors, repairs, and backs up web sites and FTP sites. It scans directories and downloads files changed since the last backup. Powerful scheduling and custom exclusions, MANY more features.
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Island Codeworks Backup Professional with DeltaBIT Technology. 

FTP-based backup program for Windows. Features include easy-to-use user interface, flexible service-based scheduling, 128 bit data encryption, data compression (DeltaBIT and LZSS) email notifications. Shareware. $35
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BackupSystems 

Backup anything anywhere! Store your important files and documents anywhere you want, even over a network or on an FTP server. Make one on one copies or store all data in a single compressed file.Switch between multiple configurations quickly!
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