Wireless Backup

Apple's hardware companion to Time Machine is an 802.11n wireless base station called Time Capsule .

Essentially the Apple Time Capsule is an Airport Extreme with an internal hard drive (500GB or 1TB).  The Time Capsule, in conjunction with Time Machine, can automatically back up all your Macs in your network.

iPhone Backup?

The Time Machine is "compatible" with other units like the iPhone but it isn't specifically mentioned that the unit can also serve as a backup for those devices.

Apple Time Machine with 500 MB hard drive: $299
Apple Time Machine with 1TB hard drive: $499