Is it possible to see the list of people who have chosen to save their progress and continue later?
If not, is there an option to send them reminders when I find it necessary?
There is no report or other function that will let you view this information directly. However, if you export the response data to an Excel spreadsheet, there is a column in the spreadsheet that indicates survey responses that have been saved. See the SurveyGizmo documentation for details – https://help.surveygizmo.com/help/save-and-continue#determine-who-used-save-continue
There is no option that will let you send a reminder to just the people who have used SAVE/CONTINUE. However, if the respondents are part of an email campaign, they will still receive any reminders that you send.