backing up kernel before recompiling

["Geoff Hing" <infoflux hotmail com>]

I have been told that it is a good idea to back up the kernel and then 
add the backup to lilo.conf so if I mess up the kernel, I can still boot 
up the old one.  How do I go about this, do I just make a copy of 
/boot/vmlinuz?  What do I need to put in /etc/lilo.conf ?  

Thanks for any help,
Geoffrey Hing

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