My backup drive is no longer bootable after TimeMachine backup to it. Why?

When I purchased a Lacie Porche 350 GB Firewire drive, I partitioned it properly via Disk Utilities and backed up my entire Hard drive using SilverKeeper to one of the two drives created by partitioning, resulting in an OS 10.4.10 Tiger bootable drive. Which I tested and it booted up perfectly. The day prior to upgrading to Leopard OS, I used SilverKeeper to back up everything on my hard drive again, since there were a lot of system software, security, also software programs and utilty updates on board since mm initial backup. Afterwards, I checked out the bootability of my back up drive (partition), which again worked perfectly.
After installing Leopard, TimeMachine recognized and asked if I wanted it to back up my hard drive (with Leopard O)S to the same (it recognized) named backup drive (partition) and I clicked yes. TM's backup of my entire hard drive went quickly and without a hitch. I knew TM's backup was not a bootable type, but figured that I still had a bootable Tiger system on the same drive if I needed to use that in an emergency and decided to test that out again.
Was wrong! Previously bootable drive no longer showed up in Startup Disk to select from in System Preferences. Thus no longer bootable! I now have 2 full backups of my entire hard drive (one with Tiger, the other with Leopard) on the one external drive, neither are bootable. Guess I can boot up from the installer DVD in emergency, but that wasn't the reason why I made a bootable backup drive to begin with.
Don't know if and what TM did that rendered the formerly bootable drive unbootable. Did nothing to change the previously working bootable drive. Anyone else have similar experience after running TM? Idea of cause? Suggestions, or work-a-round? Is this a known issue, or should this be sent to Apple's Feedback?
Thank you kindly,
superush

The TimeMachine backups were made to the same bootable clone partition that the Tiger bootable clone is on mentioned in my original post. The bootable clone was backed up there via SilverKeeper, which is included in the software that came with the 350 GB ,LaCie Porche external firewire drive.
Am now thinking that perhaps that version of SilverKeeper, which was recognized by my OS Tiger, may not be recognized by Leopard OS, and when used TM to make backup to same partition cloned bootable drive, that may have made my bootable SilverKeeper backup clone null and void.
Could that be the possibility?
Best regards,
superush

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