Learn how to back up and restore the device.
1. Apple Watch content backs up automatically to your companion iPhone, so you can restore your Apple Watch from a backup. When you back up your iPhone to iCloud or Finder, your iPhone backup will also include your Apple Watch data.
Note: For more information about backing up your companion iPhone, see Sync using Finder on your computer or Back up using iCloud.
2. If you pair Apple Watch with the same iPhone again or get a new Apple Watch, select Restore from Backup then select a stored backup on your iPhone.