yes, the WiFi-Server does the trick. Connect your iPad and your computer to the same network, enable the WiFi-Server, and open the URL that is displayed in Cubasis. Then you can download the files that are related to your project. Make sure that your Audio files are stored in the MediaBay before creating the backup (Open them in the Audio-editor and click on “Save to Media.”)
Snapshot will not backup your audio-files. It creates a copy of your project file so that you can keep specific states of your project.