Hi @Anonymous
Welcome to the Microsoft Q&A and thank you for posting your questions here.
I understand that Flexible server backup scheduled jobs failing__.__
Possible causes for the backup Fail:
1. Inner error code: ServerNotReadyForLongTermBackup
Cause: Resource isn't in a valid state to perform the backup operation.
Recommended action: Validate if the PostgreSQL - Flexible server has the following properties in its resource JSON script: "state": "Ready". If not present, wait for the state to change or fix the PostgreSQL - Flexible server properties to make it ready for backup.
2. Inner error code: ResourceGroupNotFound
Cause: Resource group isn't found.
Recommended action: Stop protection for the backup instance to avoid failures.
3. Inner error code: AuthorizationFailed
Cause: Required permissions aren't present to perform the backup operation.
Recommended action: Assign the appropriate permissions and retrigger the backup operation.
4. Inner error code: UserErrorMaxConcurrentOperationLimitReached
Cause: Limit to the number of backups that can be performed on a backup instance has reached to maximum.
Recommended action: The recommended backup frequency for backing up a server is Weekly. If you need frequent backups for achieving your RPO requirement, try to trigger a backup operation after the current backup job is complete.
5. Inner error code: UserErrorMSIMissingPermissions
Cause: The required set of permissions aren't present to perform the restore operation.
Recommended action: Assign the appropriate permissions and retrigger the backup operation.
Please see below documentation links, it might be helpful.
Troubleshoot Azure Database for PostgreSQL - Flexible server backup - Azure Backup | Microsoft Learn
I hope this is helpful! Please let me know if you have any other questions or clarifications.