The monitor checks availability of a full database backup and its age as reported by Microsoft SQL Server. This monitor is a dependency (rollup) monitor.
Knowledge Base article:
Summary
This monitor checks the existence and age of a database backup as reported by Microsoft SQL Server. This is done by running a query against the master database of the SQL instance and returning the age of the database backup. By default, the monitor does not track the 'Availability Group Backup Preferences'. If this overdrive is enabled, the monitor will track the backup location configured in the backup preferences of the availability group and will verify whether the backup on the selected replica is in compliance with the backup frequency setting.
Note that due to the Availability Group database backup specifics, the alerting for this rollup monitor is disabled by default and it is not recommended to enable it. The actual health state of the availability database backup shows the "Availability Database Backup Status (rollup)", which has the 'Best state of any member' health rollup policy option.
Availability Database has not been backed up for too long.
Resolutions
You should perform a backup of one of the availability database replicas to resolve the issue.
To eliminate this issue in future it is recommended to schedule an automated backup according to the needs of the application and business requirements.
Overridable Parameters
Name
Description
Default Value
Alert Priority
Defines Alert Priority.
Normal
Alert Severity
Defines Alert Severity.
Error
Enabled
Enables or disables the workflow.
Yes
Generates Alerts
Defines whether the workflow generates an Alert.
No
Rollup Algorithm
Defines the health state of the dependency rollup monitor to reflect either the least healthy state or the most healthy state of any member.
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