PowerClient isn't related to database. In reality it simply hosts the latest application files. Database should be only visible to user who "install" the application hosted in powerclient to their computers. To use a server in the cloud as a deployment server, you need to have an FTP and set deployment server to a remote server. There are specific settings to be able to deploy using ftp. There is a section in help file about that ("Configuring a deployment server"). Finally, I don't understand who will use that powerclient application and why this requirement to host it in the cloud. Also, as Marcin said, where will be your database?
Andreas.