I just found out about psync, which does exactly what I was looking for. I had been wanting to set up a cronjob to automatically backup my hard drive, but I didn't want a compressed backup. I wanted all resource forks kept intact as well as all permissions. To top that off, I wanted only files that had been modified since the last backup to be copied to my FW hard drive.
Read the rest of the article to see how to set up psync...
First off, you need to open up the Terminal. Once it is open, you need to open up the perl CPAN shell:
% sudo perl -MCPAN -e shellIf this is the first time you've run the CPAN shell, you'll need to configure it (either auto or manual). Once that's done, at the prompt (cpan>) that shows up, type this in:
install MacOSX::FileAfter the MacOSX File module has been downloaded and installed, type "quit" to exit the CPAN shell.
% sudo psync / /Volumes/Your_FW_Hard_DrivePress return, and type in your admin password. You're done. For more info, see man psync.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020711091017747