Back Up information
Backup includes:
App data, Apple Watch backups, Call history, Device settings, HomeKit configuration, Home screen and app organization, iMessage, text (SMS), and MMS messages, Photos and videos on your iPhone (Not Cloud), iPad, and iPod touch, Purchase history from Apple services (like your music, movies, TV shows, apps, and books, Ringtones, Visual Voicemail password (requires the SIM card that was in use during backup).
Backup Doesn’t include:
The information already stored in iCloud, like Contacts, Calendars, Bookmarks, Mail, Notes, shared photos, iCloud Photo Library, My Photo Stream, Health data, and files you store in iCloud Drive. You can check and Change these apps by going to Settings
> [your name]
> iCloud
> (If you use iOS 11, tap Manage Storage > Backup. If you use iOS 10.3, tap iCloud Storage > Manage Storage) > Choose the Name of the iPhone
> Turn off any apps you don’t want to backup