I duplicated a layer set, as it was more convenient (same style and attributes). It was working fine and both the original and new layers were showing. Then I open it up another day and the original layer looks to have vanished, and only shows the new shape layer (polygons/lines). Upon further investigation the new layer in now referencing the original layer shapefiles, the new ones are nowhere to be found. The big problem is that it resulted in the deletion of all the original old lines/polygons.
Is there a way to retrieve the original lost shape data and to make them reappear on the layer e.g. restoring a file to an earlier date?
I'm new at this and seek a step-by-step answer; links can be confusing without directions.