{ CHANNEL ['] channel_id [']
| FROM TAG [=] ['] tag_name [']
| PARMS [=] 'channel_parms'
| FROM 
  { AUTOBACKUP 
    [{ MAXSEQ | MAXDAYS } [=] integer) 
    [{ MAXSEQ | MAXDAYS } [=] integer)]... 
  | 'media_handle'
  }
}