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Not a problem, make sure that the contacts file is on the SD card, I use Astro File Explorer (free), not sure if they are saved there by default but you can export them from the contact listing on the phone to the card and then back up the card when you connect your phone to your computer, you will be able to view the card as an extra drive, copy paste contents to a folder and you're done.
There might be another way to back up the card but that is what worked for me. The Backup Assistant seems more complicated and doing more than what I need.