diff --git a/app/MindWork AI Studio/Pages/Embeddings.razor.cs b/app/MindWork AI Studio/Pages/Embeddings.razor.cs
index 3a4b8d0e..a094de7d 100644
--- a/app/MindWork AI Studio/Pages/Embeddings.razor.cs	
+++ b/app/MindWork AI Studio/Pages/Embeddings.razor.cs	
@@ -1,4 +1,5 @@
 using AIStudio.Components;
+using AIStudio.Settings.DataModel;
 using AIStudio.Tools.Services;
 
 using Microsoft.AspNetCore.Components;
@@ -10,6 +11,9 @@ public partial class Embeddings : MSGComponentBase
     [Inject]
     private DataSourceEmbeddingService DataSourceEmbeddingService { get; init; } = null!;
 
+    [Inject]
+    private NavigationManager NavigationManager { get; init; } = null!;
+
     private IReadOnlyList<DataSourceEmbeddingStatus> Statuses { get; set; } = [];
 
     private int TotalIndexedFiles => this.Statuses.Sum(status => status.IndexedFiles);
@@ -20,6 +24,17 @@ public partial class Embeddings : MSGComponentBase
 
     protected override async Task OnInitializedAsync()
     {
+        //
+        // This page belongs to the local RAG preview feature. Unlike the other preview pages, it
+        // has a route of its own, so it can be reached by typing the address even while the feature
+        // is switched off. There is nothing to show in that case.
+        //
+        if (!PreviewFeatures.PRE_RAG_2024.IsEnabled(this.SettingsManager))
+        {
+            this.NavigationManager.NavigateTo(Routes.HOME);
+            return;
+        }
+
         this.ApplyFilters([], [ Event.RAG_EMBEDDING_STATUS_CHANGED, Event.CONFIGURATION_CHANGED ]);
         await base.OnInitializedAsync();
         this.ReloadStatuses();
diff --git a/app/MindWork AI Studio/Tools/RAG/RAGProcesses/AISrcSelWithRetCtxVal.cs b/app/MindWork AI Studio/Tools/RAG/RAGProcesses/AISrcSelWithRetCtxVal.cs
index fec742fe..ed0ea76d 100644
--- a/app/MindWork AI Studio/Tools/RAG/RAGProcesses/AISrcSelWithRetCtxVal.cs	
+++ b/app/MindWork AI Studio/Tools/RAG/RAGProcesses/AISrcSelWithRetCtxVal.cs	
@@ -35,7 +35,13 @@ public sealed class AISrcSelWithRetCtxVal : IRagProcess
         //
         // 1. Check if the user wants to bind any data sources to the chat:
         //
-        if (chatThread.DataSourceOptions.IsEnabled())
+        //
+        // Data sources are a preview feature. The check belongs here rather than in the options
+        // themselves: a chat keeps its data source options while the feature is switched off, and
+        // organizations may preselect data sources through a configuration plugin. Without this,
+        // such a chat would still run the entire RAG process with the feature disabled.
+        //
+        if (PreviewFeatures.PRE_RAG_2024.IsEnabled(settings) && chatThread.DataSourceOptions.IsEnabled())
         {
             LOGGER.LogInformation("Data sources are enabled for this chat.");
             
diff --git a/app/MindWork AI Studio/Tools/Services/DataSourceEmbeddingService.cs b/app/MindWork AI Studio/Tools/Services/DataSourceEmbeddingService.cs
index 967f81ea..1c054e7e 100644
--- a/app/MindWork AI Studio/Tools/Services/DataSourceEmbeddingService.cs	
+++ b/app/MindWork AI Studio/Tools/Services/DataSourceEmbeddingService.cs	
@@ -1057,6 +1057,19 @@ public sealed partial class DataSourceEmbeddingService(
 
     private bool IsSupportedInternalDataSource(IDataSource dataSource)
     {
+        //
+        // Local RAG is a preview feature, so nothing here may run while it is switched off. This is
+        // the one place to decide that: every path which scans files, starts a watcher, creates the
+        // index database or sends text to an embedding provider asks this question first.
+        //
+        // Checking the feature instead of relying on "no data sources configured" also covers the
+        // case where somebody enabled the feature, configured local data sources, and switched the
+        // feature off again. Their data sources stay in the settings, and without this check the
+        // service would keep indexing them.
+        //
+        if (!PreviewFeatures.PRE_RAG_2024.IsEnabled(settingsManager))
+            return false;
+
         return dataSource is DataSourceLocalDirectory or DataSourceLocalFile;
     }