When a log backup is executed, the database system backs up the content of the log area (redo log entries) to version files. You can also back up the redo log entries using an external backup tool.
The database system can then overwrite the backed up redo log entries in the log area.
See also:
Concepts of the Database System, Backing Up Log Entries
Database Manager GUI, Backups
Database Manager CLI, Backing Up and Restoring Database Instances
Database
Administration in CCMS, Scheduling Log
Backups