During today's Q2 2013 quarterly earnings call, Apple revealed that iCloud now has more than 300 million users, a 20% increase from the 250 million that it reported during its Q1 earnings call in January. A year ago, iCloud had just over 100M users.
Apple's iCloud originally launched in late 2011, as a replacement for the company's MobileMe service.
iCloud, which is designed to allow users to store data from games and music, among other things, lets users sync content between multiple Apple devices. Recently, iCloud has experienced a number of service outages, with the latest occurring this morning.