Backing up system

[GMS S]

Hi,
Reading this:http://ubuntuforums.org/showthread.php?t=35087
I ran this command from terminal being root


tar cvpzf backup.tgz --exclude=/proc --exclude=/lost+found --exclude=/backup.tgz --exclude=/mnt --exclude=/media --exclude=/sys /

But the last two lines from terminal.


/boot/initrd-2.6.27.5-117.fc10.i686.img
tar: Error exit delayed from previous errors

Why is that for?
What should I do now?