Apple iCloud: A visual tour
Apple's new Web storage system will sync your music, pictures, and more.
Photo Stream Storage
Photo Stream stores the last 1000 photos on each of your devices, and you can save them permanently in an album. Macs and PCs will store all photos from the Photo Stream, since they have more space. iCloud will store each photo in the cloud for 30 days, but it's unclear what happens if you exceed the 30-day limit.
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