Enough already. I'm obviously not incentivized/shamed into writing unit tests for things in UNTESTED dir.s. It's just making a mess of the file tree

FileLiberator/BackupBook.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using DataLayer;
+using Dinah.Core.ErrorHandling;
+using FileManager;
+
+namespace FileLiberator
+{
+    /// <summary>
+    /// Download DRM book and decrypt audiobook files
+    /// 
+    /// Processes:
+    /// Download: download aax file: the DRM encrypted audiobook
+    /// Decrypt: remove DRM encryption from audiobook. Store final book
+    /// Backup: perform all steps (downloaded, decrypt) still needed to get final book
+    /// </summary>
+    public class BackupBook : IProcessable
+    {
+        public event EventHandler<LibraryBook> Begin;
+        public event EventHandler<string> StatusUpdate;
+        public event EventHandler<LibraryBook> Completed;
+
+        public DownloadBook DownloadBook { get; } = new DownloadBook();
+        public DecryptBook DecryptBook { get; } = new DecryptBook();
+		public DownloadPdf DownloadPdf { get; } = new DownloadPdf();
+
+		public bool Validate(LibraryBook libraryBook)
+            => !AudibleFileStorage.Audio.Exists(libraryBook.Book.AudibleProductId);
+
+		// do NOT use ConfigureAwait(false) on ProcessAsync()
+		// often calls events which prints to forms in the UI context
+		public async Task<StatusHandler> ProcessAsync(LibraryBook libraryBook)
+        {
+            Begin?.Invoke(this, libraryBook);
+
+            try
+			{
+				{
+					var statusHandler = await DownloadBook.TryProcessAsync(libraryBook);
+					if (statusHandler.HasErrors)
+						return statusHandler;
+				}
+
+				{
+					var statusHandler = await DecryptBook.TryProcessAsync(libraryBook);
+					if (statusHandler.HasErrors)
+						return statusHandler;
+				}
+
+				{
+					var statusHandler = await DownloadPdf.TryProcessAsync(libraryBook);
+					if (statusHandler.HasErrors)
+						return statusHandler;
+				}
+
+				return new StatusHandler();
+			}
+			finally
+            {
+                Completed?.Invoke(this, libraryBook);
+            }
+        }
+	}
+}