add {message.author.id} to backup (more consistent compared to message.author)

app.py

@@ -49,7 +49,7 @@ async def on_message(message):
             number_of_messages = number_of_messages + 1
             message_link = f"[#{message.channel.name}]({message.jump_url})"
             msgcnt = message.content             
-            backup_message = f"{number_of_messages} | {message_link} | {message.author}: {msgcnt}"
+            backup_message = f"{number_of_messages} | {message_link} | {message.author.id} | {message.author}: {msgcnt}"
             # check for attachments
             if message.attachments:
                 for attachment in message.attachments: