The following example will back up messages stored from May 1, 2004 at 1:10 pm to the present. The default is to backup all the messages regardless of their dates:
imsbackup -f /dev/rmt/0 -d 20040501:131000 /
This command uses the default blocking factor of 20. For a complete syntax description of the imsbackup command, see the Sun Java System Messaging Server 6.3 Administration Reference.