I can't afford to go back and re-enter address... especially ones I don't keep in a rolodex on my desk. The address book is my rolodex.. so I need to keep it backed up.
You can do this too -
First, Open 'Address Book'
Next, choose 'Back Up Address Book'
Now you will be prompted with this dialog box - you can change the name to whatever you wish.
Choose a safe place to save it - for this example, I am placing it
on my desktop, but I will move it to a CD-R later.
If you ever need to recover it.. or if you want to copy it to your
laptop, simply choose 'Revert to Address Book Backup'
and select the file you saved.
Now -- Go backup your address book!! - You will be glad you did!