Projects can span many years and several iterations of the load model. To help track each step of the way a history of each run of your loadmodeling.tool project is saved on the Settings Page. The panel shows all previous runs with their status, start and end times, and provides the ability to export past models!
Downloading previous runs will provide the full building analysis model. This includes the results reports and spreadsheets, along with the previous .osm and .idf model files.