Added backups of all data, restorable on another computer (#1008)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/Services/FileEnumerationResult.cs

@@ -10,10 +10,26 @@ public sealed class FileEnumerationResult
 
     public string LastError { get; set; } = string.Empty;
 
+    /// <summary>
+    /// The folders whose content could not be listed. The files below them are out of reach, not gone.
+    /// </summary>
+    public List<string> UnreadableDirectories { get; } = [];
+
+    /// <summary>
+    /// Why the file or the folder of the data source itself could not be reached, or null when it could.
+    /// </summary>
+    public string? UnreachableRootReason { get; set; }
+
     public void AddFailure(string filePath, string reason)
     {
         this.Failures.Add(new DataSourceEmbeddingFailure(filePath, reason, DateTimeOffset.UtcNow));
         this.FailedFiles = this.Failures.Count;
         this.LastError = reason;
     }
+
+    public void AddUnreadableDirectory(string directoryPath, string reason)
+    {
+        this.UnreadableDirectories.Add(directoryPath);
+        this.AddFailure(directoryPath, reason);
+    }
 }