This will remove data from your device, that has already been uploaded to the server and that is at least 2 weeks old. Data stored on the server will not be touched.
CANCELclose
DO ITdone
RESET APPdelete
This will delete all data from your device, that the app has stored on your device. This is meant for the case, when the app malfunctions. If you don't want to use the app anymore - just deinstall the app. Data stored on the server will not be touched.