diff --git a/app/MindWork AI Studio/Dialogs/Settings/SettingsDialogChatTemplate.razor.cs b/app/MindWork AI Studio/Dialogs/Settings/SettingsDialogChatTemplate.razor.cs
index f88d5bf7..b941beab 100644
--- a/app/MindWork AI Studio/Dialogs/Settings/SettingsDialogChatTemplate.razor.cs	
+++ b/app/MindWork AI Studio/Dialogs/Settings/SettingsDialogChatTemplate.razor.cs	
@@ -132,6 +132,9 @@ public partial class SettingsDialogChatTemplate : SettingsDialogBase
         if (chatTemplate == ChatTemplate.NO_CHAT_TEMPLATE || chatTemplate.IsEnterpriseConfiguration)
             return;
 
+        if (!await this.ConfirmExportOfLocalDataSources(chatTemplate))
+            return;
+
         await this.CopyChatTemplateLuaToClipboard(chatTemplate);
     }
 
@@ -145,10 +148,14 @@ public partial class SettingsDialogChatTemplate : SettingsDialogBase
 
         if (chatTemplate.FileAttachments.Count == 0)
         {
+            // That way asks about the local data sources itself, so we must not ask twice:
             await this.ExportChatTemplateWithSharedAttachmentPaths(chatTemplate);
             return;
         }
 
+        if (!await this.ConfirmExportOfLocalDataSources(chatTemplate))
+            return;
+
         this.isPluginDirectoryDialogOpen = true;
         try
         {
@@ -164,6 +171,35 @@ public partial class SettingsDialogChatTemplate : SettingsDialogBase
         }
     }
 
+    /// <summary>
+    /// Asks whether to export a template although it preselects data sources of this machine.
+    /// </summary>
+    /// <remarks>
+    /// The export writes the preselected data source IDs unchanged, which is what makes a template
+    /// usable across an organization — but a local file or folder exists here and nowhere else, so
+    /// its ID points at nothing on the machine reading the plugin. Nothing breaks, the chat simply
+    /// starts without that source, and that is precisely why it has to be said beforehand: nobody
+    /// would notice it afterwards. Exporting anyway is a fair choice, because the rest of the
+    /// template is worth rolling out.
+    /// </remarks>
+    /// <param name="chatTemplate">The chat template about to be exported.</param>
+    /// <returns>True when the export may go ahead.</returns>
+    private async Task<bool> ConfirmExportOfLocalDataSources(ChatTemplate chatTemplate)
+    {
+        var localDataSourceNames = ChatTemplate.GetPreselectedLocalDataSourceNames(chatTemplate, this.SettingsManager.ConfigurationData.DataSources);
+        if (localDataSourceNames.Count == 0)
+            return true;
+
+        var dialogParameters = new DialogParameters<ConfirmDialog>
+        {
+            { x => x.Message, string.Format(T("This chat template preselects data sources which exist on this machine only: {0}. They cannot be rolled out, so a chat started with this template elsewhere begins without them. Do you want to export the template anyway?"), string.Join(", ", localDataSourceNames)) },
+        };
+
+        var dialogReference = await this.DialogService.ShowAsync<ConfirmDialog>(T("Export Chat Template"), dialogParameters, DialogOptions.FULLSCREEN);
+        var dialogResult = await dialogReference.Result;
+        return dialogResult is { Canceled: false };
+    }
+
     private async Task CopyChatTemplateLuaToClipboard(ChatTemplate chatTemplate)
     {
         if (!chatTemplate.TryExportAsConfigurationSection(out var luaCode, out var issue))
diff --git a/app/MindWork AI Studio/Settings/ChatTemplate.cs b/app/MindWork AI Studio/Settings/ChatTemplate.cs
index afd114ef..ceacdc2f 100644
--- a/app/MindWork AI Studio/Settings/ChatTemplate.cs	
+++ b/app/MindWork AI Studio/Settings/ChatTemplate.cs	
@@ -145,6 +145,32 @@ public record ChatTemplate(
         return (templateOptions.CreateCopy(), launcherOptions is not null);
     }
 
+    /// <summary>
+    /// Names the preselected data sources which exist on this machine only.
+    /// </summary>
+    /// <remarks>
+    /// Such a source is a sensible choice inside a chat and a dead end in an export: its ID travels
+    /// into the plugin unchanged, and on the machine which reads that plugin it points at nothing.
+    /// Only ERI sources describe something the whole organization can reach, which is why they are
+    /// also the only ones the app offers an export for.<br/><br/>
+    /// IDs which match no configured source at all are left out. Those are covered by the note the
+    /// export writes above the data source IDs anyway, and the name to warn about is missing.
+    /// </remarks>
+    /// <param name="chatTemplate">The chat template about to be exported.</param>
+    /// <param name="configuredDataSources">The data sources configured on this machine.</param>
+    /// <returns>The names of the preselected local data sources, in the order they are configured in.</returns>
+    public static IReadOnlyList<string> GetPreselectedLocalDataSourceNames(ChatTemplate chatTemplate, IEnumerable<IDataSource> configuredDataSources)
+    {
+        if (chatTemplate.DataSourceOptions is not { PreselectedDataSourceIds.Count: > 0 } options)
+            return [];
+
+        var preselectedIds = options.PreselectedDataSourceIds.ToHashSet(StringComparer.OrdinalIgnoreCase);
+        return configuredDataSources
+            .Where(source => source is IInternalDataSource && preselectedIds.Contains(source.Id))
+            .Select(source => source.Name)
+            .ToList();
+    }
+
     public static bool TryParseChatTemplateTable(int idx, LuaTable table, Guid configPluginId, string pluginPath, out ConfigurationBaseObject template)
     {
         template = NO_CHAT_TEMPLATE;
diff --git a/app/Tests/Settings/ChatTemplateConfigurationTests.cs b/app/Tests/Settings/ChatTemplateConfigurationTests.cs
index c898435e..a4186a28 100644
--- a/app/Tests/Settings/ChatTemplateConfigurationTests.cs
+++ b/app/Tests/Settings/ChatTemplateConfigurationTests.cs
@@ -1,4 +1,5 @@
 using AIStudio.Settings;
+using AIStudio.Settings.DataModel;
 
 using Lua;
 using Lua.Standard;
@@ -14,6 +15,8 @@ namespace AIStudio.Tests.Settings;
 /// template says nothing" and "this template says none" survives. Both end up as an empty
 /// selection in the chat on a fresh installation, so a mistake here stays invisible until somebody
 /// sets a default tool for their chats -- and then quietly hands out a tool the template ruled out.
+/// The last tests cover what the export says out loud before it runs, for the same reason: a data
+/// source which cannot be rolled out goes unnoticed on the machine reading the plugin.
 /// </remarks>
 [TestFixture]
 public sealed class ChatTemplateConfigurationTests
@@ -183,6 +186,55 @@ public sealed class ChatTemplateConfigurationTests
         });
     }
 
+    [Test]
+    public void LocalDataSourcesOfATemplateAreNamedBeforeItIsExported()
+    {
+        var template = NewTemplate() with
+        {
+            DataSourceOptions = new()
+            {
+                DisableDataSources = false,
+                PreselectedDataSourceIds = ["11111111-1111-1111-1111-111111111111", "22222222-2222-2222-2222-222222222222"],
+            },
+        };
+
+        var localNames = ChatTemplate.GetPreselectedLocalDataSourceNames(template, ConfiguredDataSources());
+
+        Assert.That(localNames, Is.EqualTo(new[] { "Meeting notes" }), "Only the local source can be named: its ID means nothing on the machine which reads the exported plugin, while the ERI source points at something the whole organization reaches.");
+    }
+
+    [Test]
+    public void ATemplateWithoutLocalDataSourcesIsExportedWithoutAQuestion()
+    {
+        var eriOnly = NewTemplate() with
+        {
+            DataSourceOptions = new() { DisableDataSources = false, PreselectedDataSourceIds = ["22222222-2222-2222-2222-222222222222"] },
+        };
+
+        var agentic = NewTemplate() with
+        {
+            DataSourceOptions = new() { DisableDataSources = false, AutomaticDataSourceSelection = true },
+        };
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(ChatTemplate.GetPreselectedLocalDataSourceNames(eriOnly, ConfiguredDataSources()), Is.Empty);
+            Assert.That(ChatTemplate.GetPreselectedLocalDataSourceNames(agentic, ConfiguredDataSources()), Is.Empty, "An agent picks the sources per message, so this template names none to begin with.");
+            Assert.That(ChatTemplate.GetPreselectedLocalDataSourceNames(NewTemplate(), ConfiguredDataSources()), Is.Empty);
+        });
+    }
+
+    [Test]
+    public void AnIdWhichMatchesNoDataSourceIsNotReportedAsALocalOne()
+    {
+        var template = NewTemplate() with
+        {
+            DataSourceOptions = new() { DisableDataSources = false, PreselectedDataSourceIds = ["99999999-9999-9999-9999-999999999999"] },
+        };
+
+        Assert.That(ChatTemplate.GetPreselectedLocalDataSourceNames(template, ConfiguredDataSources()), Is.Empty, "There is no name to warn about, and the note above the exported IDs already tells the admin to check them.");
+    }
+
     /// <summary>
     /// A template with the parts every export needs, and nothing said about tools or data sources.
     /// </summary>
@@ -198,6 +250,15 @@ public sealed class ChatTemplateConfigurationTests
         AllowProfileUsage = true,
     };
 
+    /// <summary>
+    /// One data source of each kind: a local one, which cannot be rolled out, and an ERI one, which can.
+    /// </summary>
+    private static IReadOnlyList<IDataSource> ConfiguredDataSources() =>
+    [
+        new DataSourceLocalFile { Id = "11111111-1111-1111-1111-111111111111", Name = "Meeting notes", Type = DataSourceType.LOCAL_FILE },
+        new DataSourceERI_V1 { Id = "22222222-2222-2222-2222-222222222222", Name = "Intranet", Type = DataSourceType.ERI_V1 },
+    ];
+
     private static async Task<ChatTemplate> ExportAndReadBackAsync(ChatTemplate template)
     {
         Assert.That(template.TryExportAsConfigurationSection(out var luaCode, out var issue), Is.True, issue);