[Alug] Saving /var/log/dmesg

Hi Folks Having fun and games here trying to track down a bug that is causing my kernel to crash and do a cold boot. Much of the information I need is in the /var/log/dmesg (oops reports, etc), but this is overwritten on the next boot - Question: Is there any way of saving an old dmesg log at the next boot ? I've tried adding a "mv -f /var/log/dmesg /var/log/old-dmesg" to the end of rc.sysinit, but it copies the current dmesg log. Regards, Paul.