Use the BRBACKUP or BRARCHIVE option —g|-gun|-abort.

The key combination CTRL+C and enter stop (entering cont to continue the backup is then only possible with restrictions)

The UNIX command kill (but never kill -9)

The command brarchive -fill stop to properly stop the archiving of offline redo log files started with brarchive -f. Do not use CTRL+C or a kill command to stop such BRARCHIVE runs, as this might terminate an active copy process.