Windows How to save Windows installation?

From past couple of days my C drive windows update was giving multiple errors in downloading them. So after working nonstop for hours with Microsoft support & after reformatting the C Drive and installing windows it finally worked. Now I wanna know is there any way I can save my C drive image somewhere so that if my windows C drive gets corrupt or nonfunctional or damaged I can save that image like its now completely clean working. Also while saving should I disable the Avast Antivirus completely or keep it enabled let me know Guys. Techies guidance please and also let me know how to save and YouTube video for that?
 
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1. Select the Create a system image or
2. Select the Create a system repair disc
 
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