You can backup your data by hooking up your device via the usb cable to your computer and copy the internal and external SD cards. You can back up your system by booting into recovery and making a Nandroid backup via the recovery menu. Hope this helps.
SoccerRef12 thanks for helping us support DaveToday with information regarding how to back up his device via USB cable. For your convenience, you can also back up the information on your device with Backup Assistant, as well. Click here for details: http://vz.to/WNJMeV
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I have never been able to get BUA to work correctly on the three devices I tried it on. I recommend syncing address book and calendar with Google...never have to worry about backing up then.