[gentoo-server] Git as backup tool

[Andrey Utkin <andrey.krieger.utkin@gmail.com>]

Hi all! Long live the gentoo masters!
I'd like to hear from anybody who uses (or tried) git on production
servers for saving the points of possible restore. Please, share your
practices, like commit patterns, .gitignore contents, etc. I've begun
to use it a couple of days ago for that, and pointed out some issues.
I control the whole root fs with git.
The problematic part is bunch of files that update frequently, but i
am not familiar with them and i'm not sure if system will load without
them.
Namely, these are files in /usr/lib64/portage/pym/
Also wtmp, utmp files hurt - likely without them box won't boot, but
they shouldn't be in git control, too, coz they update often.
Thus, backup restoring requires not git repo only, but also some tar of base?

-- 
Andrey Utkin