Google App Engine deleted default GCS bucket. Is there a way to restore it?

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No, there is no way to restore a deleted bucket or object inside a bucket. DELETE operation comes under strong global consistency. Keep in mind that you can use Google Cloud Storage only after enabling billing for your project. It's not free.

 You can go through Cloud storage documentation 

 Bucket will be deleted permanently. You can see google documentation. Although a bucket will be deleted only if it is empty, means you have to delete all objects first and then you can delete an empty bucket. Choose bucket carefully as these are unique globally and can not be nested like folders or directories.

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