Follow these steps. 1) Determine your mIRC working directory by opening mIRC then typing in //echo -a $mircdir 2) Open that directory so that you can see the files. 3) Copy all *.ini files to your back-up location.
Please note that the first step only has to be done once if you are backing up the same files.
Also note that mIRC automatically backs up your active files when you perform an upgrade to a newer version.