iCloud enables you to sync all your information across multiple iOS and OS X devices.
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Pro Documents in the Cloud
Integrates different office tools such as Keynote or Pages for writing and presentations, etc with iCloud.
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.
Con Apple devices only
Con Certain file restrictions
Does not allow uploading certain file types.