Azure Backup and Azure Recovery Services are two distinct services offered by Microsoft Azure for data protection and disaster recovery.
Azure Backup is primarily designed for data protection and restoreability, whereas Azure Recovery Services (Azure Site Recovery) is focused on disaster recovery and business continuity.
The backup vault must be in the same region as the data source being backed up.
❓Is it a hard requirement that the vault be in the same region as the data source or a recommendation? Ref 1.
Vaults can be made immutable, which prevents any operations that could lead to loss of recovery points. By default, the immutability settings is reversible. To make it irreversible the setting can be locked.
Immutable vault is supported for Recovery Services vaults and Backup vaults.
In the Azure Recovery Services vault, if you delete any data mistakenly, it goes to soft delete to protect your data and recover backups. It remains in soft delete for 14 days (by default)
If the option Always-on Soft Delete is enabled when a Recovery Services vault is created, soft delete cannot not be disabled later.
There are two types of backup vaults, there are Azure Backup Vaults and Recovery Servicecs Vaults.