iCloud enables you to sync all your information across multiple iOS and OS X devices.
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Pro Synchronisation and backup services
iCloud syncs a users settings and files across a range of Apple hardware making for a simple solution to backup and sync data across ones Apple devices.
Pro Documents in the Cloud
Integrates different office tools such as Keynote or Pages for writing and presentations, etc with iCloud.
Con Apple devices only
Con Certain file restrictions
Does not allow uploading certain file types.