Backing up from USB Drive to MBLD

Is there a way to set automatic backup from my mbld USb connected hard drive to my mbld?


Thanks for responding.  Sooooo… I guess the only way to backup from my mbld USB connected drive is to do a manual copy each time from it to the Public Drive.  Is that correct? 

If so, as I have Raid turned on, I assume that whatever I copy to the Public Drive is duplciated on both mbld internal drives.  Is that correct?