Some people may regard Microsoft as the arch enemy, but the company really does quite a lot to support Apple Mac users with great software and services. Its recently renamed OneDrive (formerly SkyDrive) offers lots of online storage for your files and it is more flexible than Apple's iCloud storage.
Although Apple provides cloud storage for files, the service limits access to specific applications. This means that if you save a file from one app, you cannot easily load it from another. Each app has its own private storage space.