Backup table?

[Elahe Shafie]

Dear Friends,
When I use this command
BACKUP TABLE tbl_name[,tbl_name...] TO '/path/to/backup/directory'
why I can not get all these three files:
.frm
.MYD
.MYI
and it just return two of them(.frm and .MYD) and that is not all data and it is not correct so what should I do?
Thanks,
Elahe