Get person files to auto-backup when we save them.

EduNetworkBuilder/NB.cs

@@ -312,6 +312,7 @@ namespace EduNetworkBuilder
         public static int DefaultPasswordLen = 6;
         public static int DefaultMachinePasswordLen = 20;
         public static int DefaultSaltLen = 50;
+        public static int NormalRotation = 5;
 
         public static string AllowedPasswordCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=!~@#$%^&*()_+{}[]/?<>,.";
         public static string AllowedUsernameCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890._";
@@ -1039,6 +1040,16 @@ namespace EduNetworkBuilder
             MoveFileWithRotation(SourceFileWithDir, StandardDest, rotation);
         }
 
+        /// <summary>
+        /// Move a file out of the way, making a rotating backup at the same time.  backup to appdata
+        /// </summary>
+        /// <param name="SourceFileWithDir">A source filename with a directory</param>
+        public static void MoveFileWithRotation(string SourceFileWithDir)
+        {
+            string StandardDest = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "EduNetworkBuilder");
+            MoveFileWithRotation(SourceFileWithDir, StandardDest, NB.NormalRotation);
+        }
+
         /// <summary>
         /// Given a file, rotate it with the specified number of versions.
         /// </summary>

EduNetworkBuilder/NetworkBuilder.cs

@@ -1559,7 +1559,7 @@ namespace EduNetworkBuilder
 
             OurSettings.Save(NB.IsRunningOnMono());
             if (CurrentUser != null)
-                CurrentUser.Save();
+                CurrentUser.Save(true); //Save the person, making a backup of the person file
         }
 
         private void dHCPRequestToolStripMenuItem_Click(object sender, EventArgs e)

EduNetworkBuilder/PersonClass.cs

@@ -167,18 +167,20 @@ namespace EduNetworkBuilder
             }
         }
 
-        public void Save()
+        public void Save(bool doRotation = false)
         {
             //Save to our pre-existing / pre-defined file
             string filename = Path.Combine(filepath, FileName);            
-            Save(filename);
+            Save(filename, doRotation);
         }
 
-        public void Save(string filename)
+        public void Save(string filename, bool doRotation = false)
         {
             XmlWriterSettings settings = new XmlWriterSettings();
             settings.Indent = true;
             settings.NewLineOnAttributes = true;
+            if (doRotation && File.Exists(filename))
+                NB.MoveFileWithRotation(filename); //make a backup of the file
             XmlWriter writer = XmlWriter.Create(filename, settings);
 
             //Now we write the file: