Keep nvidia module on kernel update
probably an easy question. If I make a new kernel and run the nvidia-installer, it will delete the module of the old kernel. So if I want (or have) to boot my old kernel I must run the installer again, which will remove the modules of the new kernel.
Is there an easy way to prevent the deletion of the old modules ? Is it enough to just copy back a backup of the module (can't try it now) ?