Your Apple Watch is backed up automatically to your paired iPhone, and you can restore it from a stored backup. Apple Watch backups are included when you back up your iPhone—either to iCloud, or to your Mac or Windows device. If your backups are stored in iCloud, you can’t view the information in them.
Back up your Apple Watch: When paired with an iPhone, Apple Watch content is backed up continuously to the iPhone. If you unpair the devices, a backup is performed first.
For more information, see the Apple Support article on the managed Apple Watch, go to [account name] > iCloud > iCloud Backups, then turn off iCloud Backups.