How to create a system start up on an external drive

I bought a new external drive and I thought it would be a good idea to be able to start up from that drive in case my primary drive doesn't work.
Assuming that is a good idea I'd appreciate some tips. I downloaded a copy of Carbon Copy Cloner and was about to use it to install a copy of my system on my external but it occurred to me that I might as well use my original system software since I own it.
So if I am to install another copy of OSX on my external are there any issues to be aware of? I assume I should install a stripped down version? And how will my system know what suystem to use when it boots?
iMac, 800 MHz PowerPC G4 Mac OS X (10.4.8) 768 SDRAM

It means your clone is not recognized as bootable. Try this:
Open the Startup Disk preference in System Preferences. If your clone volume is in the icon list select it and click on the Restart button. If there's no problem with the clone your computer will boot from it. You will know that this is the case because the clone volume should appear at the top of the drive icons display on your Desktop.
To return to your normal startup volume do the above except this time select your normal startup volume before clicking on the Restart button.
This should "bless" the clone which should now be usable via OPTION booting.
If this doesn't work then for whatever reason your clone was unsuccessful. I suggest you erase the drive and do it again, but this time follow the procedure I posted previously (don't use SuperDuper.)
Be sure you also do the following before creating your clone:
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. After the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now shutdown the computer for a couple of minutes and then restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger) and/or TechTool Pro (4.5.2 for Tiger) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
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