Hi, @TinoRabe, and welcome to the Netlify community site.
There are several different approaches, for example, the one above.
If you want to keep the same subdomain for the site at Netlify (like
example.netlify.com), you can also make a new repo with the new template and then link the exist site to the new repo. This would keep your deploy history for the previous repo as well.
This can be done in the UI at Site Name > Build & deploy > Build Settings. There, click the “Edit” button and then click “Link to a different repository” - picking the new repository when prompted.
You can even do this twice if you want to test it first:
- Make a new site with the new repo.
- Test the build and deploy at Netlify.
- If it works, delete the new site and then re-link the repo to the old site as recommended above.
If there are other questions, we’re happy to answer.