Ref: Geo-backups and disaster recovery
A geo-backup is created once per day to a paired data center. The RPO for a geo-restore is 24 hours. You can restore the geo-backup to a server in any other region where dedicated SQL pool is supported. A geo-backup ensures you can restore data warehouse in case you cannot access the restore points in your primary region.
How many of these backups are retained? I can only see one available backup in the GUI.
If I run the PowerShell command 'Get-AzSqlDatabaseGeoBackup', I see one entry:
LastAvailableBackupDate : 5/5/2021 4:38:48 AM