I\'ve playing around with Google App Engine and Google Datastore for a while now and I am facing the need to take regular backups of my stuff up on the cloud.
Is there a
There is an opensource application available that I developed called "GAE datastore backup utility." It allows you to backup and restore your GAE entities through a GUI. It keeps track of your applications and your application's entities. It's currently only for Windows and Python based GAE apps but it sounds like something you are looking for. I see that you are looking for a solution for Java based apps. I will look into supporting this language in the next release.
http://code.google.com/p/gae-datastore-backup-utility/