Because ArcGIS lacks a Save As command and because changing the name of your WaterGEMS hydraulic model files will break the connection between the geodatabase and the model files, creating backups or copies of your hydraulic model requires the following procedure:

1. Make a copy of the wtg, wtg.sqlite, mdb (geodatabase), and dwh (if present).
2. Open the wtg file in a text editor, look for the "DrawingOptions" tag, and change the "ConnectionString" attribute to point to the new copy of the geodatabase. (e.g. ConnectionString=".\GeoDB.sqlite").
3. Open the geodatabase in MS Access, look for the table named "WaterGEMSProjectMap", and edit the value in the "ProjectPath" column to point to the new copy of the wtg file. (e.g. ".\Model.wtg").