check this
http://picard.ocis.temple.edu/~stan/NetWorker/index.html
or use commands like:
mminfo -xm -r "client, name, ssid, cloneid, level, totalsize, nfiles, ssflags, copies, savetime(25), ssinsert (25), sscomp (25), ssbrowse,ssretent, group, volume, pool, location" -q "ssinsert > -5 years" >...