Thanks for the reply. I read somewhere that an encrypted zip file will change the entire contents on every save, though I am not sure. The reason i am using Winzip (.zipx files) is because they can encrypt my files and I use winzip at my work as well. If I use EncFs, I guess I should save the original contents (unencrypted) in a different folder, which is not secure. Do you know of any encrypted software which is secure as well as portable, and can also sync with bittorent sync without uploading entire file everytime?