For databases utilizing Availability Groups. When backups are requested by a secondary replica the primary must receive a series of commands to ensure co-ordination. When the primary replica is waiting for commands it will accumulate this wait. Small values are expected but excessive values should be investigated

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Suggested solutions

  1. Check the SQL Server error log for more information
  2. Examine wait statistics on the instance for other Availability Group issues. Investigate accordingly

Additional research

Active Secondaries: Backup on Secondary Replicas
AlwaysOn Availability Groups Troubleshooting and Monitoring Guide

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