-m|-modify 

Input syntax: -m [<delay>]

Default value: No delay

Delay: The offline redo log files which are created are sent to the standby database before they are processed. This could happen with a delay time of <delay> minutes after creating the ORACLE offline redo log file.
If there is a standby database, brarchive -m must be called in order to transfer the offline redo log files.

See: Standby Database Scenario