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Differential/Log backup of SQL database fails with the error "The Backup Exec SQL Agent was not used to create the last full backup of this database. You must use the SQL Agent to run a full backup before you run a differential backup or transaction
1. Make sure no SQL backups run outside Backup Exec (including SQL in-built utility for Backups and Restores) as that would interrupt the continuity of SQL backups within Backup Exec schedule causing the job to fail.
Run the following query against the MSDB database for the SQL instance.
select name, backup_start_date
from msdb..backupset
where database_name = 'dbname'
order by backup_start_date desc
where the "dbname" needs to be replaced with the actual database name for which the job fails with the above error.