Tried skipping files in case of a timeout instead of just retrying. Then noticed that the timeout couldn't actually be thrown. Added logging for that case to investigate.

src/main/java/de/fabianonline/telegram_backup/CommandLineDownloadProgress.java

@@ -36,6 +36,7 @@ class CommandLineDownloadProgress implements DownloadProgressInterface {
 		System.out.println("'S' - Sticker       'A' - Audio         'G' - Geolocation");
 		System.out.println("'.' - Previously downloaded file        'e' - Empty file");
 		System.out.println("' ' - Ignored media type (weblinks or contacts, for example)");
+		System.out.println("'x' - File skipped because of timeout errors");
 		System.out.println("" + count + " Files to check / download");    
 	}
 	
@@ -47,6 +48,7 @@ class CommandLineDownloadProgress implements DownloadProgressInterface {
 	public void onMediaAlreadyPresent(AbstractMediaFileManager fm) {
 		show(".");
 	}
+	public void onMediaSkipped() { show("x"); }
 	
 	public void onMediaDownloadFinished() { showNewLine(); System.out.println("Done."); }
 	

src/main/java/de/fabianonline/telegram_backup/DownloadManager.java

@@ -239,6 +239,7 @@ public class DownloadManager {
 				System.out.println("");
 				System.out.println("Telegram took too long to respond to our request.");
 				System.out.println("I'm going to wait a minute and then try again.");
+				logger.warn("TimeoutException caught", e);
 				try { TimeUnit.MINUTES.sleep(1); } catch(InterruptedException e2) {}
 				System.out.println("");
 			}
@@ -271,8 +272,13 @@ public class DownloadManager {
 			} else if (m.isDownloaded()) {
 				prog.onMediaAlreadyPresent(m);
 			} else {
-				m.download();
-				prog.onMediaDownloaded(m);
+				/*try {*/
+					m.download();
+					prog.onMediaDownloaded(m);
+				/*} catch (TimeoutException e) {
+					// do nothing - skip this file
+					prog.onMediaSkipped();
+				}*/
 			}
 		}
 		prog.onMediaDownloadFinished();

src/main/java/de/fabianonline/telegram_backup/DownloadProgressInterface.java

@@ -26,6 +26,7 @@ public interface DownloadProgressInterface {
 	public void onMediaDownloadStart(int count);
 	public void onMediaDownloaded(AbstractMediaFileManager a);
 	public void onMediaDownloadedEmpty();
+	public void onMediaSkipped();
 	public void onMediaAlreadyPresent(AbstractMediaFileManager a);
 	public void onMediaDownloadFinished();
 }