There's actually a howto about this: http://www.knoppix.net/docs/index.ph...PartitionHowTo follow it and you'll be fine.

You have cuplicate entries in fstab for hda3:
/dev/hda3 /home ext3 rw,auto,users,exec 0 2
/dev/hda3 /mnt/hda3 ext3 noauto,users,exec 0 0 , as this is noauto it shouldn't matter though.

Code:
root@box1:/etc# mount /home
root@box1:/etc# mv /home /home.bkp
mv: cannot move `/home' to `/home.bkp': Device or resource busy
root@box1:/etc# umount /home
root@box1:/etc# mv /home /home.bkp
root@box1:/etc# mount /home
mount: mount point /home does not exist
root@box1:/etc# mv /home.bkp /home
Take it easy with mv until you have home copied somewhere:
sudo mkdir /home.bkp
cd /home
sudo cd -Rp * /home.bkp/ EDITops, cd should of course be cp