Your AVD host pool uses FSLogix user profiles stored in an Azure Files share named share1. You need to back up share1 with Azure Backup. Which resource should you create first?

To back up Azure Files shares using Azure Backup, you must first create an Azure Recovery Services vault. This vault acts as a storage entity for your backups and provides the necessary infrastructure for managing backup policies and restoring data. While an Azure Storage account is where share1 itself resides, and an Azure Files share is the specific resource being backed up, neither of these are the initial resource you create for the backup service. An "Azure Backup vault" is not a distinct resource type; Azure Backup functionality is provided through the Azure Recovery Services vault.