This BRRESTORE command option restores database files saved by BRBACKUP.
-b|-backup|-b1|-backup1 <log name>|last
Default value: last successful backup of the database ( last)
<log name>: name of the detail log file b<encoded timestamp>.<ext> from a BRBACKUP backup. The requested objects are then restored from that database backup.
last: the last successful database backup is used to restore the requested objects