Allway Sync: Easy file sync for Windows, now with Amazon S3 support
The latest version also adds support for synchronizing files with an FTP server or Amazon S3 storage. This makes Allway Sync a great little tool for backing up your files to offsite storage. The only problem is that there's no built-in scheduler. You have to initiate each sync job manually. If you're lazy and prefer automated backups, you might be better off with a utility like Jungle Disk. But the advantage of performing manual backups is that Allway Sync provides detailed information about each new, changed, or questionable file.
[via Ed Bott]