	Device Select bkup/rstr/cmpr device.
	------------------------------------

	This function defines the device which will be used for the 
	backup/restore/compare process. It is the device to which the 
	backup will be written or from which the restore/compare data 
	will be read. The Device menu selection will prompt the user for 
	such a device. It may be a file, a block device (eg. /dev/fd0) or 
	a character special device such as a tapedrive (eg /dev/rmt0 or 
	/dev/st0). 

	   *********************************************************
	   * NOTE there is nothing to stop you specifying /dev/hda *
	   * though take it from me, this would not be a sensible  *
	   * thing to do. Specify regular files, floppy or tape    *
	   * devices only unless you know what you are doing !!!   *
	   *********************************************************
	   * **************** YOU HAVE BEEN WARNED *************** *
	   *********************************************************
	
	If a regular file is selected, it will be given an extension 
	appropriate  to the compression mode selected. The default 
	compression mode is gzipped (extension = .tgz) but may be set to 
	Compress mode (extension = .tar.Z) or no compression (extension = 
	.tar). Compression will be discussed in more detail later. 

	IT IS THEREFORE NOT USUALLY NECESSARY TO SPECIFY A FILE
	EXTENSION

	NOTE: If a filename called backup.tgz is entered, L.B.U will use a 
	file  called backup.tgz.tgz (assuming default compression mode is 
	in force).

	If a filename that exists is specified, the user will be warned
	that it will be overwritten when the backup starts. If this
	is not acceptable, the user may re-select the backup device.

	If a filename that does NOT exist is specified, the user will be
	informed that it will be created.

	NOTE: A RESTORE operation will fail if the filename does not exist.

	In all cases there MUST be a full path to the file selected. For 
	example, the file /usr/jwb/lbu/backup.tgz will only be valid if 
	/usr/jwb/lbu exists as a directory. 

	Directories or links not be accepted as backup devices. Attempting 
	to select any of these will result in an  appropriate message. Also, 
	selection of no device will abort the process and throw the user 
	back to the main menu.

	If a device has been successfully selected it is displayed on the 
	main menu as a reminder of the choice made.
