A backup allows you to copy and save the information from your iPhone, iPad, or iPod touch. If you replace your device, you can use a backup to transfer your information to a new device.
What data is saved in iPhone backup?
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.
Is iCloud backup necessary?
You don't actually have to back your devices up to iCloud, though it is convenient; you can use a Mac or PC running iTunes instead. ... In the future, your iOS device(s) will automatically be backed up to your computer when it is connected, and you won't need to store those backups on your frugal iCloud account.
