ok, so I can write my own plugin for export raw data for example every nite at 2 o'clock. Should I implement the IReport interface? wich function may I call for exporting raw data -in cvs format? in the plugin API docs I found just one method called getReportHtml for this interface, but I'm not sure this could be what I'm looking for.
Actually, it is not that simple. You actually need to get all respondents for a survey one by one, get the response value for each, and write it to a file. All of this is doable from the API, but a little work to do.
We'll see if we can get the built-in export exposed in an API call. Perhaps 6.3 or 6.4.