By default, the log files in the wal directory that are backed up during a backup operation are deleted after the backup job. If you want, , you can avoid this by deselecting the Archive Delete check box at the instance level.
Note
The backup log file deletion is only supported for FSBased backups.
Procedure
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From the CommCell Browser, navigate to <Client> | PostgreSQL. 
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Right-click the <Instance>, and then click Properties. 
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Click the Log Backup tab. 
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Select the Archive Delete check box. 
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Click OK. 