Added an empty history entry class

BackupEssentials/Backup/History/HistoryEntry.cs

@@ -0,0 +1,9 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BackupEssentials.Backup.History{
+    class HistoryEntry{
+    }
+}

BackupEssentials/BackupEssentials.csproj

@@ -80,6 +80,7 @@
     <Compile Include="Backup\BackupReport.cs" />
     <Compile Include="Backup\BackupRunInfo.cs" />
     <Compile Include="Backup\BackupRunner.cs" />
+    <Compile Include="Backup\History\HistoryEntry.cs" />
     <Compile Include="Data\DataStorage.cs" />
     <Compile Include="Data\ExplorerIntegration.cs" />
     <Compile Include="Backup\IO\IOAction.cs" />

BackupEssentials/Data/DataStorage.cs

@@ -10,7 +10,7 @@ using System.Linq;
 namespace BackupEssentials.Backup.Data{
     class DataStorage{
         public enum Type{
-            Locations
+            Locations, History
         }
 
         private static readonly ScheduledUpdate SaveTimer = ScheduledUpdate.Forever(10,() => {
@@ -21,11 +21,14 @@ namespace BackupEssentials.Backup.Data{
 
         public static readonly ObservableCollection<BackupLocation> BackupLocationList = new ObservableCollection<BackupLocation>(new List<BackupLocation>(8));
         public static readonly ChangeTracker BackupLocationListTracker = new ChangeTracker();
+        public static readonly ObservableCollection<HistoryEntry> HistoryEntryList = new ObservableCollection<HistoryEntry>(new List<HistoryEntry>(32));
+        public static readonly ChangeTracker HistoryEntryListTracker = new ChangeTracker();
 
         static DataStorage(){
             SaveTimer.Start();
 
             BackupLocationList.CollectionChanged += Tracker(BackupLocationListTracker);
+            HistoryEntryList.CollectionChanged += Tracker(HistoryEntryListTracker);
 
             foreach(Type type in Enum.GetValues(typeof(Type))){
                 LoadedData[type] = false;