Using my iPad Pro-4th Gen: backing up
My iPhone 14 and iPad are synced data. If I backup my iPad is the data on my iPhone backed-up also?
iPad Pro, iPadOS 16
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Data that is synced (e.g., iCloud Photos) is not also included in an iCloud backup.
See the following (and other information) from What does iCloud back up? - Apple Support
Your iPhone, iPad, and iPod touch backups only include information and settings stored on your device. They do not include information already stored in iCloud such as Contacts, Calendars, Bookmarks, Notes, Reminders, Voice Memos4, Messages in iCloud, iCloud Photos, and shared photos. 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.