How to upgrade from 3.4.4 to 3.4.5?

Hi
please, How to upgrade from 3.4.4 to 3.4.5 without losing configuration, header images and other things?
I have read an old thread but I'm not sure.
Thanks
[UPDATED POST]
I have just read other post that says:

Download the zip-file with new version
In Appearance > Add New Themes > Upload
Browse and add your zip-file > Install Now
Activate theme
Normally, all your settings will be retained as they were with the old version.

And later he says that i must make copy of my header images (before upgrading).
is this correct?
have i to save anything more?

Thanks