ngSurvey sets and uses the less possible data on the respondent's browser while taking the survey.
If you have linked Google Analytics on your survey make sure to check as well Google Analytics latest cookie policies.
Cookies
None
Localstorage
ngssurveysessionXXX stores the unique code to resume the respondent session if automatic save / resume as been enabled on the survey. XXX is replaced by the survey id.
ngscookieaccepted keeps track if the user has accepted the cookie policy
