How to create an alternate startup drive?

I upgraded to 10.8.3 from the Internet and therefore do not have a boot DVD since buying Snow Leapard.
I need to create an alternate startup disk. 
How do I do this with Mountain Lion using an external HD (WD myBook) connected via USB?
TIA!!

Clone your current system to your external drive. This will erase the target drive so be sure you don't have anything on the drive that you don't want to lose. Alternatively, create a separate partition on the drive for the clone. You will need enough free space on the drive to hold everything that is on your startup volume.
Clone Lion/Mountain Lion using Restore Option of Disk Utility
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     1. Select Disk Utility from the main menu then press the Continue
         button.
     2. Select the destination volume from the left side list.
     3. Click on the Restore tab in the DU main window.
     4. Select the destination volume from the left side list and drag it
         to the Destination entry field.
     5. Select the source volume from the left side list and drag it to
         the Source entry field.
     6. Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive.

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    oracle/6.1: Volume label:
    oracle/6.1: Volume tag: feef494efdea10285e7000c2944f637
    oracle/6.1: Volume UUID: 27fb5faa-fdf3-102c-a243-000c2944f637
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    oracle/6.1: Volume set ID: RMAN-DEFAULT-000006
    oracle/6.1: Previous volume: RMAN-DEFAULT-000006
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    oracle/6.1: Media family: RMAN-DEFAULT
    oracle/6.1: Volume set expires: never; content manages reuse
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    oracle/6.1: File section: 2
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    oracle/6.1: Client host: test
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    oracle/6.1: wrt_iorate 1.3 MB/S
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