dakota:
I can't give you the details (mainly because I don't know them well enough on OS X), but I do know you're going about this the hard way. I would (and do use) retrospect desktop backup software. It backs up everything I have to my external firewire drive without flaw (invisble link files, icons, permissions, and all), and it only backs up what has changed since your last backup. You can even buy the cheaper retrospect express to do the same things, or if you have a .mac account, you can use Apple's backup software (Virex) for free.