Saving user previous entries on a survey

We want to allow employees to complete our survey without having answer all the survey questions in a single sitting.  We want them to be thoughtful about the answers they provide so they may spend 30 minutes completing a few of the questions and then return to their work before returning to the survey later in the day or even the day after to complete the other questions.  How do i set the form up so their previous entries are saved for them to pick up where they last ended or make edits to their previous entries?

We currently have two form types, Classic Forms and Card Forms.

If you'll be using Classic Forms, please check out this guide in order to setup a Save and Continue Later feature.

How-to-Save-Forms-and-Continue-Later

Meanwhile for Card Forms, please see this guide:

Setting-up-the-Continue-Forms-Later-Feature-in-Card-Forms