[gadgetguy08]

I can't say which is best because I haven't tried but one. I can say that SPB Backup is quite thorough and has saved my bacon more than once. It creates a self extracting executable that you can run and completely rebuild your device without having to reinstall the software. It also allows selection of one or more files from that executable for a partial restore. There is a PC component that allows you to extract files on your desktop/laptop and then move them with ActiveSync over to your device. You can set up scheduled backups and manage the number of copies you keep. It costs $25 and is worth it IMO.