Is there a way to restore a previous version of a story map?
Sorry about the issue. There's not a way to restore an older version of a Story Map app or the web map(s) that it is using.
In this sort of situation where it is a bit hard to see what is happening via the forum, and where it is something that may be critical to your work, we'd always recommend contacting Esri Support to have an analyst there walk through an issue with you. We and the other folks in the storytelling community try and respond to posts here, but Support is always recommended if you need immediate help.
Somewhat related to this: You can use Save as to make a copy of a web map, but there's no Save As for web apps in ArcGIS Online, although that it is frequently requested feature and is definitely on the radar here. It is possible to duplicate a story map: see this FAQ.
Retrieving data ...