Hello,
What are you backing up in this job? Are you backing up Lotus Notes database by any chance? If yes, is it a partitioned server?If more than one of the partitions are active then when the Lotus API attempts to backup Domino databases on any of the subsequent partitions the API call fails to acquire access to the Domino Databases. When attempting to backup the database the error as seen in the logs are observed. In case you are running any aniti virus during the job, stops it and then try the backup.
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Regards.