LinuxBSDos: Truecrypt is said to be published under an open source license, but in some quarters, its license has not been accepted as a valid open source license. And some of those people believe it has a backdoor.
Amazon's Cloud Drive was unveiled two years ago for the primary purpose of letting customers store music files purchased from Amazon. Although you could upload other files to Cloud Drive, it wasn't a replacement for cloud storage services like Dropbox because it didn't automatically sync files from one computer to another.
Today, that limitation is gone. "The new app for Windows and Mac now includes File Sync, which lets users easily store and access files in the Amazon Cloud from a folder on their computer," an Amazon spokesperson told Ars in an e-mail. "Files in this folder are automatically stored in Cloud Drive and can be accessed from a computer or the Web. When you install the app on a second computer all of your synced files are available there as well. The updated app makes it simple for users to put files in Cloud Drive and to access them from any of their computers, ensuring that they always have access to the latest version of their files from home and on the road."
Like Dropbox, Google Drive, or Microsoft's SkyDrive, the Cloud Drive desktop application (download it here) creates a new folder in your file manager. The desktop application supports all Windows versions from XP to 8 and Mac OS X 10.6, 10.7, and 10.8.