Add warning about backup

public/chat/index.html

@@ -904,7 +904,7 @@ <h3 class="text-center">Welcome to BioImage.IO Chatbot</h3>
           info.classList.add("alert")
           info.classList.add("alert-info")
           info.role = "alert"
-          info.innerHTML = `<strong>Info:</strong> The code interpreter runs entirely in-browser. Mounted data stays in-browser, won't be uploaded to any server. Code execution results, like print messages, are sent to the chat server.`
+          info.innerHTML = `<strong>Info:</strong> The code interpreter runs entirely in-browser. Mounted data stays in-browser, won't be uploaded to any server. Code execution results, like print messages, are sent to the chat server. WARNING: Please ALWAYS keep a backup before mounting your data folder.`
           $('#chat1 .chat-dialog-header').after(info)
         }
         $('#console-btn').show()