can i restore a survey from 3 days ago after changes have been made in it?
There is a limited ability to do this. You can use the RESTORE function to add deleted questions back into your survey. You can see the details in the SurveyGizmo documentation – https://help.surveygizmo.com/help/restore-deleted-questions
Unfortunately this function will not help you with any changes you have made to the question titles or answer options. Those will have to be restored manually.