85760ac8_zure_Database___Cerebrata_Blog__Description
[S.No] 8. [Parameter Name] -BlobContainerName [Description] 
Name of the blob container where this back up data should be uploaded. If the specified blob container does not exist, it will be created. If this parameter is not specified, then this cmdlet auto-assigns the name of the blob container which matches [database name]-backup-[backup start date time] pattern.
Backup SQL Azure Database | Cerebrata Blog
Description