Hi!

Updating nginx should not affect any config files that you have created or modified. You can update nginx to the latest version by running sudo apt-get update to update the package lists, followed by sudo apt-get install nginx.

If you want to be extra careful, you can back up the /etc/nginx directory which contains all of nginx’s config files.

sudo cp -r /etc/nginx /etc/nginx.pre-upgrade

After upgrading the package, you can delete /etc/nginx and move /etc/nginx.pre-upgrade back to /etc/nginx. However, as I said, it is unnecessary and completely optional to do it.