I am reading the latest Martin Evening book on LR 4.0 and have a question about backups. First, if I backup to an external drive, do the original RAW files get backed up there as well? Related to this question, obviously if the external drive is not connected then a backup cannot be made unless I change destination to some folder on the laptop. Also related, does EXPORTING the entire catalog, with negatives to the external drive do the same thing that a backup does? Any help appreciated.