Azure SQL Database now has a license free option for a secondary disaster recovery database as standby replica:
https://techcommunity.microsoft.com/t5/azure-sql-blog/general-availability-of-license-free-standby-replica-for-azure/ba-p/4139089
This is in addition to the original high-availability (HA) and disaster-recovery (DR) options listed here:
https://www.microsoft.com/en-us/sql-server/blog/2019/10/30/new-high-availability-and-disaster-recovery-benefits-for-sql-server/
And the newer options for pay-as-you-go options listed here:
https://www.microsoft.com/en-us/sql-server/blog/2022/11/16/new-sql-server-on-azure-virtual-machines-and-azure-sql-managed-instance-dr-benefits/