I have an ongoing survey or a tracking survey. Do charts update automatically?

Yes. All charta are automatically updated when you update or append your data set with new responses. THere is no need to create new charts or save charts again. Even charts that have been share on the web (public or private) are automatically updated. 

Which means, if you run an ongoing survey or a tracking survey, the effort required to update your deliverables is ZERO. You simply update a new file and that's it. 

This is a huge benefit as you can prepare your charts upfront and share with your audience (by embedding on your site or via ChartBooks), and then watch them see the most upto date results.