Difference Between iCloud Backup and iCloud Drive

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From CNET: For many an iPhone or iPad user accustomed to syncing their devices to their desktops or laptops, the 2011 arrival of Apple’s iCloud service created no small amount of head-scratching. No more syncing? iCloud backs up everything or just some things? What about photos? And do apps like Facebook really need to be backed up to the cloud? Continue reading