moving data between ext3 and ext4

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http://www.linuxquestions.org – I have a drive with ext3 that was my old /home drive. When I moved to 9.04 I went with ext4 and just linked to my old home drive. My old ext3 drive is becoming unstable so I want to back it up. I have a 500gb ata drive (unfortunately not a sata drive) that Im going to wipe and put 10.04 on. I want to move my data from this backup drive Im going to back up to, to the new 10.04 until I get another hd as a backup drive. My question is, I know there is some issue between ext3 and 4 and I dont want to get into a bind. What would be the best format for moving between all this to get to where I w (HowTos)