Hello ziad45,
Thank you for posting in the Apple Support Communities and for reviewing the related article, Manage Health data on your iPhone, iPod touch, or Apple Watch. We'd like to share some information with you.
Did you store Health data in iCloud? If so, then Health data won't be included in an iCloud backup. According to the Apple Support article below, "Some information is not included in an iCloud backup but can be added to iCloud and shared across multiple devices like Mail, Health data, call history, and files you store in iCloud Drive." Read more about this feature here:
What does iCloud back up?
To get Health data to automatically appear in the Health app on your new iPhone 13, tap on Settings > [your name] > iCloud > Health. Check out the iPhone User Guide below to learn more:
Back up your Health data on iPhone
We hope this information is useful. Kind regards.