The Save and Continue option allows your respondents to save the responses in the middle of the survey and come back and continue later. This is very helpful if the survey is long.
Go to:
The email address used for the Email Invitation options is used as the From email address to the email with the continuation link.
When respondents click on the Save and Continue button the response is saved in the database as a partial (incomplete) response. Once the respondent continues with the survey and completes it, the same response set is updated and marked as complete.