I have a simple one-page form (name, address, etc). I would like to export the data of the submitted webform by the user into CSV / XLS files.
How do I do that?
If you are using the webform module you can download submission's results in csv/xls files. if you want to do that go to:
content => select the webform you need to export => click on the result tab => finaly click on the download button.
If you need more flexibility like exporting multiple webforms Which fulfill certain conditions.
Just to add information to HusterFrancis posts. People who who feel limited by the core contact functionality in Drupal 8. There is a beta version webform 8.x.
Works very well. It does everything from scratch. (Export of data input, conditional rules, e-mail handling, etc)