hi i forget my itunes encrypted backups password how can get it

Read about it in this Apple document --> About encrypted backups on your iPhone, iPad, or iPod touch - Apple Support

A related user tip --> Disable iOS backup encryption - Apple Community

Hello. If you have forgotten the password for an encrypted backup, you will be unable to recover it. Your best option will be to reset your backup password in order to make new encrypted backups. If your device is running iOS 11 or later, you can do this by following the below steps:

1. On your device, go to Settings > General > Transfer or Reset [Device] > Reset.
2. Tap Reset Network Settings and enter your device passcode.
3. Follow the steps to reset your settings. This won't affect your user data or passwords, but it will reset settings like display brightness, Home Screen layout, and wallpaper. It also removes your encrypted backup password.
4. Connect your device to the Finder or iTunes again and create a new encrypted backup using the steps above.

If you have an older device, such as one running iOS 10 or earlier, you will be unable to reset the password. If this is the case, you will need to follow the steps below:

• Use an iCloud backup instead. If you don't have an iCloud backup, you can make one.
• Try using an older iTunes backup.

More information regarding encrypted backups is available here.