Export a Survey

Exporting a survey allows you to back it up, share it with others, or migrate it to another LimeSurvey instance.

These are two different things:

Exporting a survey (this article) saves the survey itself — its questions, groups, logic and settings — as a file you can re-import.
Exporting results downloads the responses your participants gave, for analysis in Excel, SPSS and similar tools. For that, see Exporting Questions and Responses.

Open the survey from your survey list, then use the "..." menu → Tools → Export.

You'll now be prompted to choose from several export options:

Survey structure (.lss): Recommended for backups or importing to another LimeSurvey instance.
Survey archive (.lsa): Includes the structure plus response, participant, and timing data. Note that this option is only available for active surveys.
queXML format (.xml): The survey in the queXML schema, an open standard for describing questionnaires.
Tab-separated-values format (.txt): The survey structure as tab-separated text, openable in a spreadsheet.
Printable survey (PDF or HTML): Generates a static copy of the survey.