Azure Backup vault vs. Recovery Services vault:
Microsoft Learn. (2024). Backup vault overview. "Backup vaults store backup data for newer Azure Backup workloads... (e.g., Azure Database for PostgreSQL servers, Azure Blobs, Azure Disks)... Recovery Services vaults store backup data for a range of workloads... (e.g., Azure VMs, SQL in Azure VMs, Azure file shares)."
Reference: https://learn.microsoft.com/en-us/azure/backup/backup-vault-overview
FSLogix (Azure File Share) Backup:
Microsoft Learn. (2024). About Azure file share backup. "Azure Backup uses a Recovery Services vault to store... backups of Azure file shares."
Reference: https://learn.microsoft.com/en-us/azure/backup/azure-file-share-backup-overview
Region Constraint (File Shares):
Microsoft Learn. (2024). Support matrix for Azure file share backup. "The Recovery Services vault and the Azure file share to be backed up must be in the same region."
Reference: https://learn.microsoft.com/en-us/azure/backup/azure-file-share-support-matrix#region-support
Data Disk Backup:
Microsoft Learn. (2024). About Azure Disk Backup. "Azure Disk Backup offers a turnkey solution... to back up your disks... It uses a Backup vault."
Reference: https://learn.microsoft.com/en-us/azure/backup/disk-backup-overview
Region Constraint (Disks):
Microsoft Learn. (2024). Support matrix for Azure Disk Backup. "The Backup vault, the disk to be backed up, and the snapshot resource group must be in the same region."
Reference: https://learn.microsoft.com/en-us/azure/backup/disk-backup-support-matrix#region-availability