Iomega has created a handy backup device called the Iomega SuperHero, that will backup your iPhone while it charges. Even though iTunes will auto backup your the data from your iPhone it might not always be convenient to connect to your iTunes account and this neat little device creates a good backup fail-safe, just in case any disaster should strike your iTunes account.
To start using the backup system simply install the free SuperHero iPhone Backup App on any of the supported devices : iPhone 3G, 3GS and iPhone 4. Then every time you dock your phone the SuperHero will backup your contacts and photos automatically on to the provided 4GB SD card.
If you have multiple iPhones in your household dont worry the SuperHero can support backups for multiple devices.