iCloud is a cloud storage and cloud computing service by Apple launched in October 2011. The service allows users to keep data such as calendars, contacts, reminders, photos, documents, bookmarks, applications, notes, and more in sync across multiple compatible devices (iOS devices running with iOS 5 or later, computers with Mac OS X 10.7.2 or later, and Microsoft Windows) using a centralized iCloud account. The service also allows users to wirelessly and automatically back up their iOS devices to iCloud. iCloud also provides other services such as Find My iPhone—to track a lost phone and wipe it remotely, Find My Friends—to share location with friends and notify the user when a device arrives at a certain location, and so on.

Signing up with iCloud is free and simple to do with an Apple ID. When you sign up for iCloud, Apple grants you access to 5 GB of free remote storage. If you need more storage, you can purchase the upgrade plan. To keep your data secure, Apple enforces...