Use the bpsyncinfo command.

USAGE: bpsyncinfo [-l|-L|-U] [-v] [-M master_server,...]
       bpsyncinfo -delete <id> [-v] [-M master_server,...]
       bpsyncinfo -doBackup [-v] [-M master_server,...]
       bpsyncinfo: [-paths <"path1 path2 ...">] [-v] [-M master_server,...]
           [-server <hostname connected to device>]
           [-bw <backup when>]
           [-id1 <id> [-d1 <densitystr>]]
           [-id2 <id> [-d2 <densitystr>]]

       densitystr is required if media type is tape
       the list of paths must be enclosed in double quotes and blank
delimited
       backup when choices:  never, session or dbupdate
       id is either a media ID or path