SkyDrive is Microsoft's cloud storage service. It originally launched with 25GB of free storage, but new users get a more modest 7GB. There's no way to earn free storage. To increase your limit, you can subscribe for as little as $10 per year, upping your account by 20GB. Twenty-five dollars a year will get you 50GB, while $50/year gets you another 100GB. SkyDrive has Windows, Mac, iOS, Windows Phone, and Android apps available to keep your files in sync.