how to backup the programm data of an application on anddroid with the adb bridge

You can back up the program data of an application on Android using the Android Debug Bridge (ADB). Here are the steps to do so:

### Prerequisites
1. **Android Device**: Ensure that your device is connected to your computer.
2. **USB Debugging**: Make sure USB debugging is enabled on your device. You can enable it in `Settings` > `Developer options`.
3. **ADB Installed**: Ensure ADB is installed on your computer. It is included with the Android SDK Platform Tools. You can download it from the [official Android Developer site](https://developer.android.com/studio/releases/platform-tools).

### Steps to Back Up Application Data

1. **Open Command Prompt / Terminal**:
   - On Windows, you can search for `cmd`.
   - On macOS or Linux, open the Terminal.

2. **Verify Device Connection**:
   Run the following command to ensure that your device is connected and recognized by ADB:

   ```
   adb devices
   ```

   You should see a list of connected devices. If your device is listed, you're good to go.

3. **Backup Application Data**:
   To back up the data of a specific application, use the following command:

   ```
   adb backup -apk -shared -all -f backup.ab <package_name>
   ```

   Replace `<package_name>` with the actual package name of the application. For example, for the Facebook app, the package name is `com.facebook.katana`.

   If you want to back up all apps and their data, simply omit `<package_name>`:

   ```
   adb backup -apk -shared -all -f backup.ab
   ```

   If you want to just back up a single app without backing up all apps, use this command:

   ```
   adb backup -apk -f backup.ab <package_name>
   ```

   - The `-apk` flag includes the APK file in the backup.
   - The `-shared` flag includes shared storage (like media files).
   - The `-f backup.ab` specifies the filename for the backup.

4. **Confirm Backup on Device**:
   After executing the backup command, a prompt will appear on your device asking for confirmation to create a backup. Confirm the operation.

5. **Backup File**:
   After completing the backup, a file called `backup.ab` will be created in the current directory where you ran the `adb` command.

### Restoring the Backup

To restore the backup, use the following command:

```
adb restore backup.ab
```

This will restore the app's data and APK to the device.

### Note
- Some applications may restrict backup and restore due to security policies. In such cases, the backup may not include all data.
- ADB backups may not work on all Android versions due to various restrictions, especially after Android 9 (Pie).

### Conclusion
By following these steps, you can successfully back up and restore application data using ADB on your Android device.