Like I said I am a beginner. Even with the setup page there is a lot to learn. I am 71 so I focus on one thing at a time. Right now I am trying to understand end stops and the Z probe. A lot of other things a addressed in the setup page. For example I want to home z/probe in the middle of the table so I move x and y both to 250 in the config.g file.
Now I am trying to learn about the thermisters. If I use the setup page to adjust the thermisters or anything else it overwrites the changes I made to the config.g file. I guess I wish the setup page was like visual studio and a lot of other IDEs where only the areas I changed in the setup files were changed in the system files.

I guess I can understand why you might want to overwrite some or even most of the changes. But still I wish there was a way not to overwrite some of them.

Ok, that worked.
Thank you.
But it only partly answered my question. Probably;y because I did not ask it right.
And I don't know how to explain what I am trying to do.
If I make a change to the config.g file like this
" ;this is just a test comment to see if it gets overwritten when I load a new config.zip file"
When I rerun the setup web page using the previous config.json I saved on my PC and then make the zip file and let my printer load it from the pc it overwrites the comment. Is there anyway to save my printer system files to a config.json file then move it to my PC (just like you showed me with the zip file). That way I can load it on the printer setup page and the changes I made to the old config.g files won't be lost.

I am new to the duet wifi. I installed the duet wifi on a Creality CR-10 s5, and am now trying to soak it all in.
Using the Setup page is a breeze. I save my changes to the config.json file then upload the zip file to printer. Then when I use the config setup page again, I just open the config.json file. That way I don't lose my changes. I love it!
My question is – I have advanced far enough that I am making changes to the g code files themselfs, is there any way to save the files and changes to a config.json file and send them back to the computer, so I don't lose the changes if I run the setup again?