I'm using Google AppEngine with build-in datastore. But, I want move all datastore to my new VPS.
I'll use Apache Cassandra. How to move from GAE Datastore to Apache Cassandra?
My guess is you're looking at a tool such as the bulk loader/downloader:
http://code.google.com/appengine/docs/python/tools/uploadingdata.html
You'll want to export all your data into CSV, then write a script to import this into any new format you want.
You can not use the bulk downloader if you are using the "High Replication" datastore. You can use a manual aproach such as listing all your entities as dictionaries. You will have a JSON formatted string. By using this you can generate your entities again suitable for your new system.
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