Input syntax:
-bd|-backup_delete [<log_name>|last ]Default:
last·
<log_name> : The BRBACKUP backup to disk with the log name entered in < log_name > is copied to the current backup tape.·
last : BRBACKUP selects the last successful backup to disk and copies this to the current backup tape.After the backup the data is automatically deleted from the disk.

Backup of the last disk backup with the same parameters as defined in init<DBSID>.sap followed by deletion:
brbackup -bd
See also:
Two-Phase Backup