Box 1: never -
The 10.2.9.0/24 subnet is not whitelisted.
Box 2: never -
After you configure firewall and virtual network settings for your storage account, select Allow trusted Microsoft services to access this storage account as an exception to enable Azure Backup service to access the network restricted storage account.
![AZ-104_150E.jpg related to the Microsoft AZ-104 Exam](/static/microsoft/AZ-104_images/AZ-104_150E.jpg)
Reference:
https://docs.microsoft.com/en-us/azure/storage/files/storage-how-to-use-files-windows
https://azure.microsoft.com/en-us/blog/azure-backup-now-supports-storage-accounts-secured-with-azure-storage-firewalls-and-virtual-networks/