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 iTunes, your iPhone backup will also include your Apple Watch data.Note: For more information about backing up your companion iPhone, see Sync using iTunes 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.