Converting log backups to full backups
This option also detects if a full recovery database was switched to the simple recovery model and back to the full recovery model. In this scenario, the log chain is broken and SQL Server requires a differential backup before a subsequent log backup can be created. If NetBackup detects this situation, the backup is converted to a differential database backup. For batch file-based policies, you can enable this behavior with the keyword CONVERTBACKUP.
NetBackup only converts a transaction log backup if a full backup was never performed on the database. If a full backup does not exist in the NetBackup catalog but SQL Server detects an existing full LSN, NetBackup performs a transaction log backup and not a full. In this situation, you can restore the full backup with native tools and any differentials and log backups with the NetBackup web UI or the NetBackup MS SQL Client. Or, if the backup was expired by NetBackup, you can import the full backups into the NetBackup catalog. Then you can restore the full, differential, and log backups with the NetBackup web UI or the NetBackup MS SQL Client.