Cloud services, for example Dropbox, take every precaution to keep your data
secure, but things can go horribly wrong when you don't have physical control
of your documents. Check out this on-the-fly encryption which is the best way
to work with most sync or storage services in the cloud. Your programs have
direct access to the unencrypted contents of your files, and the on-the-fly
encryption process presents the encrypted files to the cloud. Once it's set
up, the smooth, client-side conversion requires no direct action by the user.
http://www.techsupportalert.com/best-free-encryption-utility-for-cloud-storage
