I have a iphone 3G, I am trying to update my phone to the 4.2.1 update

I have an iphone 3G, and I am trying to update my phone to the 4.2.1 software, when I begin to update my phone it tells me that all the files have to be backed up on my computer first.  The issue is my phone has been hooked up to my computer backing up my phone for 6 hours and still no update, in fact maybe 10% of my info from my phone is backed up after 6 hours????  So is it because my phone is so old or is it the number of apps??? I have updated my itunes and everything. How can I backup faster so I can update or will it just have to run its course, please HELP!!!

Backing up, Updating and Restoring
http://support.apple.com/kb/HT1414
Backup and Set Up as New Device
http://support.apple.com/kb/HT4137

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