If you ask your respondents to enter their email, you can set your web form up to email them a copy of the data they entered.
Options > Email Receipts > Send a receipt to the submitter on submission
Set the "To:" field to the email address field. Modify the other information as necessary.
Mark the box at the bottom of the page to turn on the option "Include submitted data."
Thanks, but I’m looking for a way for respondents to save their data before they submit.
I believe the only way to do that is to have them complete a submission-enabled .pdf form, which can be saved at any time.
I know that the submission-enabled pdf will work, however, my survey has skip logic which cannot be used with pdf.