[arch-general] Stage 5 , Arch Wiki?

Hello everyone, So for the past few days I've been playing with Gentoo and Funtoo. I've learned a lot. I learned about something called Stage 4 and 5, which you can basically do to your system in order to make a backup copy of it, and put it in a tarball. I don't see any Wiki pages for this, so I was thinking that maybe I can write one once I learn more about it. Anyone think this is necessary? -- Jonathan Vasquez