rsync ignoring --suffix option

rsync -auve ssh --backup --suffix='2008-10-03-1514539' --backup-dir='/tmp/' module.pm root@web1:/path/to/module.pm

i run management but --backup-dir choice copies record over, creates backup tide timestamp. i consolidate --backup-dir option, creates backup /tmp/ office nonetheless never attaches suffix.

there zero advise can't both options together. i've played around method also zero seems repair it.

does anyone have fortitude this?