This article explains how to back up your Apple Watch and save your data. It applies whether you're upgrading to a new watch or want to make sure your data is saved in the Health app.
How to Backup and Restore Your Apple Watch: Easy Steps
There is no independent backup feature for the Apple Watch, but you can activate a backup in two ways:
Regardless of the method you choose, your Apple Watch data is dependent on your iPhone’s ability to perform a successful backup. If your iPhone is performing nightly backups and your Apple Watch is paired with your iPhone, your data should be backed up and ready to go.
It turns out that your Apple Watch regularly shares data with your iPhone. Any data that your Apple Watch syncs to your iPhone is automatically added to the information that is backed up when your phone performs a backup. This information includes:
