You can set up a reminder(s) to send out an email to users who have not completed the survey.

You can choose to send out the reminder email only to users who have partially completed the survey.

You can choose to send out the reminder email only to users who have not started the survey.

You can also choose to send an email out to users who have not started or only partially completed the response by clicking both boxes.

You can also create more then one Reminder by clicking the + symbol.