Backup and restore
Although we do back up datastore entity properties of type BlobKey and Blob, we do not back up the related blobs themselves that are stored in Blobstore or Google Cloud Storage. Nor do we back up the datastore BlobInfo entities associated with these blobs.
You can use the Datastore Admin tab of the Admin Console to back up entities of selected kinds and, when needed, restore from a selected backup, with the backup/restore affecting all namespaces.
The backup and restore feature is intended to help you recover from accidental deletes of data. When you restore from a backup, any new entities added since the backup are retained, and entities that existed at backup-time and that were modified after the backup are overwritten with values from the backup. You can restore all data from a backup or you can restore specific entity kinds from the backup. In addition, you can also use this feature to restore a backup of one app's data to some other app, provided that you use Google Cloud Storage for your backups.
You can use either Blobstore or Google Cloud Storage as the location where backups are stored, as described in the instructions below. If you choose the Google Cloud Storage (GCS) option, you must specify a bucket. Applications created with App Engine 1.9.0 or greater have a GCS default bucket that you can use with no further configuration or permissions necessary. Or, if you wish, you can use another GCS bucket that you have set up with write permissions for your app.
Read full article from Backup/Restore, Copy, and Delete Data - Google App Engine — Google Cloud Platform
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