Can I recovery my project source of the cloud ?
in this URL only appears option delete
appcenter.html5tools-software.intel.com/csd/controlpanel.aspx to download the most recent version of you files in the cloud.
If you had a successful build, you can download that build and then open the app to get your source code. The packages that you build are ZIP files. So, for example, if you download an APK file you can rename it to ZIP and then open with your favorite ZIP tool. Look inside and you'll find your source code, as well as a list of plugins. Unfortunately, the project configuration files will not be there, so you'll have to redo that part by hand.
Please do not rely on the XDK to backup your source code, that is something you should be doing yourself.