The following is shown on Sprite site. It seems confusing since we call the Treo700w a smartphone. Are you sure ours is what they call a Pocket PC?
From Sprite Web Site
If you are not sure which version of Sprite Backup is right for your mobile device, try looking for these distinguishing features:
» If your device is touchscreen, and has a "Start" button displayed somewhere on the screen, it is a Pocket PC
» If your device is not touchscreen, has a number keypad and works with ActiveSync software, it is a Smartphone NOTE: Sprite Backup does not currently support Windows 2005 SmartPhone devices. Support for these devices will be added starting the 1st of March 2006