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Back up data using Google Cloud Datastore and Google Drive.

I need some basic understanding of the Google cloud as a whole. Trying, I have an Android application that will store the user's contact, photo, etc. with a cloud, in this case -

1. What service should I use - Google Cloud Storage or Google Drive?

If I use Google Cloud Storage, how do I do this? Is this how we create an application backend using an Entity class with an endpoint class, thereby storing it in a NoSQL cloud node? If I do, is there a limit to the storage space that the application can use?

2.If I use a Google Drive, how do I do this? Should I first store the data in xml and then save it to Google Drive?

3.Whats the difference between appengine schemaless NoSQL datastore and cloudSQL, which is better for storing user data.

4. What is the name of the application or application firewall - the Android client application in the device or the backend module (with entity class, endpoint class, etc.) that is uploaded to the cloud? What about the web interface (which is automatically generated by the IDE) is it necessary?

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1. What service should I use - Google Cloud Storage or Google Drive?

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