Once the production system is working, you may think that the job is done and the developers can switch to a new project. Unfortunately, in most cases the server will still need to be maintained to make sure that everything is working as expected, to ensure that the web server is always up, and much more. A large part of this job can be automated, which will save time. It will also increase the uptime of the server, since automated processes generally work faster than manual ones. If created properly, automated processes also will always work correctly, whereas human operators are likely to make occassional mistakes.