Archiving
To archive a survey, you look for the correct survey and click on the pull down menu on the right of this survey. After that, you click on Archive in the pull down menu. The survey will be placed in your archive!
This archive can be found at Archive in the survey overview. By clicking on this you will see the archive overview.

Deleting
To delete a certain form permanently, you have to follow the first steps explained for archiving. First, you click on the pull down menu behind the form and then click on Archive. To permanently delete the form, you have to go to your Archive. After that, you'll have to look for the right form and choose whether you want to restore this or delete it permanently.
Restoring
Want to keep the form? In your archive just click on Restore behind the form.

Updated about a month ago