Hi. Not quickly finding this question answered elsewhere here, so here goes...

I have installed some software on my Ubuntu 17.10 distro and have it working (hooray!). How can I back up the current distro as it sits on my machine as an installable ISO, just in case I break something in the future and need to reinstall Linux? Obviously my intent is to avoid having to reinstall and configure software successfully installed today.

Thanks in advance.