diff --git a/TerraformingShared/SaveLoad/SaveLoadExtensions.cs b/TerraformingShared/SaveLoad/SaveLoadExtensions.cs
new file mode 100644
index 0000000..114f343
--- /dev/null
+++ b/TerraformingShared/SaveLoad/SaveLoadExtensions.cs
@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace TerraformingShared.SaveLoad
+{
+    static class SaveLoadExtensions
+    {
+        public const string IndicationFileName = ".saved";
+    }
+}
diff --git a/TerraformingShared/SaveLoad/SaveLoadManagerPatches.cs b/TerraformingShared/SaveLoad/SaveLoadManagerPatches.cs
index 653b773..ab995ef 100644
--- a/TerraformingShared/SaveLoad/SaveLoadManagerPatches.cs
+++ b/TerraformingShared/SaveLoad/SaveLoadManagerPatches.cs
@@ -2,16 +2,18 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Text;
 using Terraforming.WorldStreaming;
+using TerraformingShared.SaveLoad;
 using UnityEngine;
 
 namespace Terraforming.SaveLoad.SaveLoadManagerPatches
 {
     [HarmonyPatch(typeof(SaveLoadManager))]
-    [HarmonyPatch("SaveToTemporaryStorageAsync")]
+    [HarmonyPatch(nameof(SaveLoadManager.SaveToTemporaryStorageAsync))]
     [HarmonyPatch(new Type[] { typeof(IOut<SaveLoadManager.SaveResult>), typeof(Texture2D) })]
     static class SaveToTemporaryStorageAsyncPatch
     {
@@ -34,10 +36,25 @@ static IEnumerator PostfixAsync(SaveLoadManager saveLoadManager, IEnumerator ori
             }
             octreesStreamer.WriteBatchOctrees();
 
+            WriteOctreesIndicationFile();
+
             LargeWorldStreamer.main.frozen = false;
             saveLoadManager.isSaving = false;
 
             yield break;
         }
+
+        private static void WriteOctreesIndicationFile()
+        {
+            var saveFilePath = LargeWorldStreamer.main.tmpPathPrefix;
+            var compiledOctreesPath = Path.Combine(saveFilePath, BatchOctreesStreamerExtensions.CompiledOctreesDirName);
+            var indicationFilePath = Path.Combine(compiledOctreesPath, SaveLoadExtensions.IndicationFileName);
+
+            if (!File.Exists(indicationFilePath))
+            {
+                Directory.CreateDirectory(compiledOctreesPath);
+                File.WriteAllBytes(indicationFilePath, new byte[0]);
+            }
+        }
     }
 }
diff --git a/TerraformingShared/SaveLoad/UserStoragePCPatches.cs b/TerraformingShared/SaveLoad/UserStoragePCPatches.cs
index eacb493..8a8257f 100644
--- a/TerraformingShared/SaveLoad/UserStoragePCPatches.cs
+++ b/TerraformingShared/SaveLoad/UserStoragePCPatches.cs
@@ -16,112 +16,6 @@ namespace TerraformingShared.SaveLoad
     [HarmonyPatch(typeof(UserStoragePC))]
     static class UserStoragePCPatches
     {
-        [HarmonyPatch(nameof(UserStoragePC.UpgradeSaveData))]
-        [HarmonyTranspiler]
-        static IEnumerable<CodeInstruction> RemoveDeletingOctrees(IEnumerable<CodeInstruction> instructions, ILGenerator generator, MethodBase originalMethod)
-        {
-            var codeMatcherCursor = new CodeMatcher(instructions);
-            
-            Action<CodeMatcher, ILGenerator>[] patchers =
-            {
-                AssignEmptyArrayToOctreesLocal
-            };
-
-            try
-            {
-                foreach (var patcher in patchers)
-                {
-                    patcher.Invoke(codeMatcherCursor, generator);
-                }
-            }
-            catch (Exception ex)
-            {
-                Logger.Error(ex.ToString());
-
-                codeMatcherCursor.ReportFailure(originalMethod, Logger.Error);
-
-                return instructions;
-            }
-
-            return codeMatcherCursor.InstructionEnumeration();
-        }
-
-        private static void AssignEmptyArrayToOctreesLocal(CodeMatcher codeCursor, ILGenerator generator)
-        {
-            List<Label> labels;
-
-            codeCursor.Start();
-            codeCursor.MatchForward(useEnd: false,
-                new CodeMatch(OpCodes.Ldarg_0),
-                new CodeMatch(OpCodes.Ldstr, "compiled-batch-*.optoctrees"),
-                new CodeMatch(OpCodes.Ldc_I4_1),
-                new CodeMatch(OpCodes.Call, AccessTools.Method(typeof(Directory), nameof(Directory.GetFiles), new[] { typeof(string), typeof(string), typeof(SearchOption) }))
-            );
-            codeCursor.ThrowIfInvalid("Could not find call to Directory.GetFiles with octrees search pattern");
-
-            labels = codeCursor.Instruction.ExtractLabels();
-
-            codeCursor.RemoveInstructions(4)
-                .InsertAndAdvance(new CodeInstruction(OpCodes.Call, AccessTools.Method(typeof(UserStoragePCPatches), nameof(GetEmptyArray))).WithLabels(labels));
-        }
-
-        private static string[] GetEmptyArray()
-        {
-            return new string[] { };
-        }
-
-        [HarmonyPatch(nameof(UserStoragePC.UpgradeSaveDataAsync))]
-        [HarmonyTranspiler]
-        static IEnumerable<CodeInstruction> SkipOctrees(IEnumerable<CodeInstruction> instructions, ILGenerator generator, MethodBase originalMethod)
-        {
-            var codeMatcherCursor = new CodeMatcher(instructions);
-
-            Action<CodeMatcher, ILGenerator>[] patchers =
-            {
-                RemoveOctreesPattern
-            };
-
-            try
-            {
-                foreach (var patcher in patchers)
-                {
-                    patcher.Invoke(codeMatcherCursor, generator);
-                }
-            }
-            catch (Exception ex)
-            {
-                Logger.Error(ex.ToString());
-
-                codeMatcherCursor.ReportFailure(originalMethod, Logger.Error);
-
-                return instructions;
-            }
-
-            return codeMatcherCursor.InstructionEnumeration();
-        }
-
-        private static void RemoveOctreesPattern(CodeMatcher codeCursor, ILGenerator generator)
-        {
-            List<Label> labels;
-
-            codeCursor.Start();
-            codeCursor.MatchForward(useEnd: false,
-                new CodeMatch(OpCodes.Brtrue),
-                new CodeMatch(OpCodes.Ldloc_S),
-                new CodeMatch(OpCodes.Ldstr, "compiled-batch-*.optoctrees"),
-                new CodeMatch(OpCodes.Ldc_I4_1),
-                new CodeMatch(OpCodes.Call, AccessTools.Method(typeof(Directory), nameof(Directory.EnumerateFiles), new[] { typeof(string), typeof(string), typeof(SearchOption) })),
-                new CodeMatch(OpCodes.Call)
-            )
-            .ThrowIfInvalid("Could not find condition with call to Directory.EnumerateFiles uses octrees search pattern");
-
-            labels = codeCursor.Instruction.ExtractLabels();
-
-            codeCursor.RemoveInstructions(6);
-
-            codeCursor.Instruction.WithLabels(labels);
-        }
-
         [HarmonyPatch(nameof(UserStoragePC.UpgradeSaveDataAsync))]
         [HarmonyPostfix]
         static void EnsureCompiledOctreesBackFromBackup(UserStoragePC __instance, string backupPath, ref UserStorageUtils.UpgradeOperation __result)
@@ -133,17 +27,16 @@ private static UserStorageUtils.UpgradeOperation EnsureCompiledOctreesRestoredFr
         {
             if (!string.IsNullOrEmpty(backupPath) && Directory.Exists(backupPath))
             {
-                string compiledOctreesDirName = BatchOctreesStreamerExtensions.CompiledOctreesDirName;
-
                 var saveContainersToRestore = new List<string>();
                 foreach (string saveSlotDir in Directory.GetDirectories(userStoragePC.savePath))
                 {
                     string saveFileName = Path.GetFileName(saveSlotDir);
-                    string saveCompiledOctreesPath = Path.Combine(saveSlotDir, compiledOctreesDirName);
-                    string backupSaveCompiledOctreesPath = Path.Combine(backupPath, saveFileName, compiledOctreesDirName);
+                    string saveCompiledOctreesPath = Path.Combine(saveSlotDir, BatchOctreesStreamerExtensions.CompiledOctreesDirName);
+                    string saveCompiledOctreesIndicationFilePath = Path.Combine(saveCompiledOctreesPath, SaveLoadExtensions.IndicationFileName);
+                    string backupSaveCompiledOctreesPath = Path.Combine(backupPath, saveFileName, BatchOctreesStreamerExtensions.CompiledOctreesDirName);
 
-                    // Restore save slot if exists in backup and is empty in target save location
-                    if (Directory.Exists(backupSaveCompiledOctreesPath) && !Directory.EnumerateFiles(saveCompiledOctreesPath).Any())
+                    // Restore save slot if exists in backup and there is no indication file in target octrees location
+                    if (Directory.Exists(backupSaveCompiledOctreesPath) && !File.Exists(saveCompiledOctreesIndicationFilePath))
                     {
                         saveContainersToRestore.Add(saveSlotDir);
                     }
@@ -182,8 +75,21 @@ private static void RestoreCompiledOctreesFromBackup(object owner, object state)
                 {
                     try
                     {
-                        string newSaveCompiledOctreesPath = Path.Combine(saveSlotPath, compiledOctreesDirName);
-                        UWE.Utils.CopyDirectory(backupSaveCompiledOctreesPath, newSaveCompiledOctreesPath);
+                        string saveCompiledOctreesPath = Path.Combine(saveSlotPath, compiledOctreesDirName);
+
+                        Directory.CreateDirectory(saveCompiledOctreesPath);
+                        foreach (var backupSaveCompiledOctreesFilePath in Directory.EnumerateFiles(backupSaveCompiledOctreesPath, "compiled-batch-*.optoctrees"))
+                        {
+                            var oldFileName = Path.GetFileName(backupSaveCompiledOctreesFilePath);
+                            var newFileName = oldFileName.Replace("compiled-batch", BatchOctreesStreamerExtensions.CompiledOctreesFileNamePrefix);
+
+                            var saveCompiledOctreesFilePath = Path.Combine(saveCompiledOctreesPath, newFileName);
+
+                            File.Copy(backupSaveCompiledOctreesFilePath, saveCompiledOctreesFilePath, true);
+                        }
+
+                        string saveCompiledOctreesIndicationFilePath = Path.Combine(saveCompiledOctreesPath, SaveLoadExtensions.IndicationFileName);
+                        File.WriteAllBytes(saveCompiledOctreesIndicationFilePath, new byte[0]);
 
                         Logger.Info(string.Format("Compiled octrees restored from backup for save {0}.", saveFileName));
                     }
diff --git a/TerraformingShared/TerraformingShared.projitems b/TerraformingShared/TerraformingShared.projitems
index 05e60e6..6561fd9 100644
--- a/TerraformingShared/TerraformingShared.projitems
+++ b/TerraformingShared/TerraformingShared.projitems
@@ -15,6 +15,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)MainPatcher.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Messaging\ErrorMessageExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Messaging\ErrorMessagePatches.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)SaveLoad\SaveLoadExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SaveLoad\SaveLoadManagerPatches.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SaveLoad\UserStoragePCPatches.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\BuilderExtensions.cs" />
diff --git a/TerraformingShared/WorldStreaming/BatchOctreesStreamerExtensions.cs b/TerraformingShared/WorldStreaming/BatchOctreesStreamerExtensions.cs
index be0a89f..80436ad 100644
--- a/TerraformingShared/WorldStreaming/BatchOctreesStreamerExtensions.cs
+++ b/TerraformingShared/WorldStreaming/BatchOctreesStreamerExtensions.cs
@@ -10,7 +10,8 @@ namespace Terraforming.WorldStreaming
 {
     static class BatchOctreesStreamerExtensions
     {
-        public static readonly string CompiledOctreesDirName = "CompiledOctreesCache";
+        public const string CompiledOctreesDirName = "CompiledOctreesCache";
+        public const string CompiledOctreesFileNamePrefix = "batch-compiled";
 
         public static string GetTmpPath(this BatchOctreesStreamer batchOctreesStreamer, Int3 batchId)
         {
@@ -21,7 +22,7 @@ public static string GetTmpPath(this BatchOctreesStreamer batchOctreesStreamer,
                 Directory.CreateDirectory(tmpPathPrefix);
             }
 
-            var fileName = $"compiled-batch-{batchId.x}-{batchId.y}-{batchId.z}.optoctrees";
+            var fileName = $"{CompiledOctreesFileNamePrefix}-{batchId.x}-{batchId.y}-{batchId.z}.optoctrees";
             var fullPath = Path.Combine(tmpPathPrefix, fileName);
 
             return fullPath;