I have a feeling I know the answer to this but want to make sure before I start redoing all the work.
I've recently started using QGIS to help with mapping of an estate. Last week a created a new vector polygon layer (and associated shapefile) to map the woodland. By Friday afternoon I'd completed the mapping and entry of all the attributes for each polygon.
I opened up QGIS this morning to show a colleague the progress and the layer is at a point I reached on Thursday afternoon. All my updates (the bulk of the work) made on Friday aren't there. The confusing bit is that when I check the underlying shapefiles in Windows Explorer the .dbf .shp .sxh files are all showing a last modified date of 1638 on Friday, when I last saved before the weekend.
I've tried creating a new vector layer based on these but with no success.
Update - I've now recreated all the polygons and associated attributes. But have been thinking more about what could have caused the original issue. If I had only been saving layer edits during the Thursday and Friday and then not saved the project before going home on Friday, could this have potentially caused the issue? I can't be certain this is what I did but trying to find an explanation so I can avoid it in the future.