Looks like savetime needs date range. When i put as below it works.
C:\PROGRA~1\Legato\nsr\bin>mminfo -s brwsbckp -q "savetime >='07/28/07',savetime <='07/29/07'" -r "group,client,totalsize,nfiles"
Second question : How do i find out which system currently backing up to this legato ? I have numerous system which don't backup at persent.