Can I use a Time Machine Backup (on an external drive) as a "start up" drive?  I need to do a disk repair.

I am upgrading my MacBook Pro (17"; Intel Core Duo; Speed 2.16 GHz; 2 GB 667MHz DDR2 SDRAM) from Leopard (10.5.8) to Snow Leopard (10.6.8).  I successfully Time Machine to make a backup to an external LaCie drive.  Some issues appeared when I ran a "disk verify," and need to change the startup drive to boot up and use "repair disk."  When I tried to change the startup drive (in System Preferences) the drive with the Time Machine Backup was not recognized.  Can I even use Time Machine to create a bootable drive?  I use Carbon Copy Clone with my iMac (and can boot from the clone), but that is not an option when running OSX 10.5.8.

Only if the backup was created by Mac OS X 10.8 or newer. Use the Mac OS X 10.6 install DVD instead.
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