Fredy, your question was about the same than asking that "I bought Windows 7 installation DVD back in 2009. Now I want to reinstall my Windows using that DVD, do I need to update it then?"
First, you really need to understand I am a backup freak. According to me the three most important things in computing are backup, backup and backup

. That's why my backup strategy is not necessary good for you.
The term
Initial System Image(*) is not an official term or expression. It is, as far as I know, coined together by me to describe a System Image which you can use to restore your system to a guaranteed working state.
What I mean with it and how I would like you to see it is that your Initial System Image is what you use when you would like to wipe / remove / delete all changes made to your system
since creation of that image. That point in time, state of Windows, must of course be such that you can be 100% sure everything works, that going back to that point you have a perfectly working system.
You can of course select yourself what that point in time is. Setting up a new PC, it's the image you created when everything was installed. On an exisiting system it is the one you created when you had not installed anything let's say in a month, so you were sure the system was running well without any issues, and you decided "OK, up till now I have done it correctly and I do not need older images! I will create a new Initial System Image and archive it to be able to go back to this moment whenever I want to.".
I for instance re-create this Initial Image every now and then. When my system has been OK and working without issues for a few weeks, I know that I can speed up a possible restore by creating a new Base Image, Initial System Image. I copy my original Initial Image to a disk where I keep backups of earlier backups of even earlier backups... (I told I am a freak, I keep several generations images just to be sure, each well documented so I know to which point it would take me if used for system restore). after the old Initial Image stored away I create a new one.
My whole point is that for me this my way to speak about an Initial System Image means an image of a 100% working, no issues, no bulls*** Windows, an Image I know that whatever happens will help me to get back my PC as it was when everything worked.
You do not have to use Audit Mode when creating images later on, especially if everything works. If you decide to boot to Audit Mode on an existing Windows installation, it always exits to OOBE boot meaning you have to create "first" user and name the PC and Windows will start as if first time. If you do not want this, create your later images normally in Windows.
Kari
(*) Initial System Image = ISI: I like this acronym because isi is daddy in my native Finnish
