You can use the interactive log backup to back up all the pages of the log area that have been written since the last log backup.
If you back up the log entries in version files, a version file is also generated for the last log segment, which may not be full.
Prerequisites
A full data backup of the current database instance has been created.
You can perform interactive log backups in operational mode ONLINE or ADMIN.
You cannot perform any other backup while the interactive log backup is running.
See also: Backing Up
Use the Database Manager or, in SAP systems, the DBA Planning Calendar to perform interactive log backups.
Database Manager GUI: SAP DB 7.4, Section Backup Processes
Database Manager CLI: SAP DB 7.4, Commands for Backing Up and Archiving
Database Administration in CCMS: SAP DB OLTP, DBA Planning Calendar