Old Backup History

This warning has been raised because backups older than 60 days (by default, although this can be changed in Aireforge Studio) have been detected.

Suggested Action

• Clear down old backup history entries (which could take a while).
• Implement a job to maintain the backup history.

How to Clear Down Old Backup Entries in SQL Server

DECLARE @oldest_date DATE = DATEADD(day, 60, GETDATE());
EXEC msdb..sp_delete_backuphistory @oldest_date;

Further Reading

sp_delete_backuphistory (Transact-SQL) | Microsoft Docs

Backup History and Header Information (SQL Server) | Microsoft Docs