Cannot boot from time machine disk

I have a 2012 MacPro with 1 SSD and 3 Mechanical Disks installed. The disk in Bay 4 I use as a time machine disk, but upon booting the computer and holding down option I was only able to select my primary OSX Boot device ("Macintosh SSD") with no other bootable devices listed. If I have Time Machine on an external disk, I am able to select it as a boot device.
I just had a recent scare with a completely currupted disk that needed reformatting, so I'm checking everything I have to make sure it works as expected.  Not being able to actually boot from the Time Machine disk to restore my computer if anything should go wrong with the Primary SSD and Hard Disk is quite worrysome.
How would I boot from an Internal Time Machine disk?
UPDATE:
I have found that I do not have internet recovery and I also do not have a Recovery HD.
I am downloading Mountain Lion from the App store again and will try and create some recovery media from that.
Message was edited by: Ginger-Ben

You should be using Carbon Copy Cloner to put a bootable copy of your SSD on another disk drive (it will offer to create ML Recovery volume also).
Cloning
Using Cloning as a Backup Strategy
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
You can have one drive that has clone of all the other drives in multiple partitions.
You could have more than one TimeMachine drive and a copy (cloned partition) of the system on each.
I do NOT understand why you can boot from TimeMachine on an external drive.
I have never even tried to boot from TimeMachine. You mean Recovery mode, not a standard system?
Mac Basics: Time Machine
Hold down the Option key at startup to boot into the startup manager. Select the Recovery system of the Time Machine backup to start from. Once started, you will have all of the functionality of Recovery.
https://support.apple.com/kb/HT1427
Mac OS X Recovery: http://support.apple.com/kb/HT4718
What I do and what I think you should include and add to your backup strategy:
An SSD *NEEDS* to have a disk image for restore if and as needed (and you need TRIM Enabler, and you need TE on your secondary drive.
You / we always have needed an "emergency / maintenance boot drive"
You can shrink and create 120GB partition on your backup drive but never have just one backup set or drive, "all your eggs in one basket" does not work forever.
Your OPTION boot should, if you installed ML or it came with it and you installed or cloned to the SSD, had one, or using "Command + R" on startup to boot from Recovery Mode. Trouble with that is if the drive needs to be formatted, and an SSD should be at times, you can only erase another partition, not the entire device.
Mac OS X & Mountain Lion Community
https://discussions.apple.com/community/mac_os
https://discussions.apple.com/community/mac_os/os_x_mountain_lion?view=discussio ns
Recovery Mode
http://support.apple.com/kb/HT4718
Cloning
Using Cloning as a Backup Strategy
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner 
http://www.bombich.com/software/updates/ccc-3.5.html
OS X Lion Install to Different Drive
How to create an OS X Lion installation disc MacFixIt
Migration Assistant Update for Mac OS X Snow Leopard
http://www.apple.com/support/lion/installrecovery/
Create an OS X Lion Install disc
http://reviews.cnet.com/8301-13727_7-20080989-263/how-to-create-an-os-x-lion-ins tallation-disc
http://www.coolestguyplanettech.com/how-to-make-a-bootable-osx-10-8-mountain-lio n-disc-or-drive-from-the-downloaded-mountain-lion-app/
How to clone your system:
http://macperformanceguide.com/Mac-HowToClone-backup.html
http://macperformanceguide.com/Mac-HowToClone.html
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
http://www.macperformanceguide.com/blog/2012/20120711_2-MacPro-internal-clone-ba ckup.html
Before you clone, install TRIM Enabler!
And after you clone, run Disk Utility's REPAIR DISK on the SSD -- just to be on the safest side. http://www.macupdate.com/app/mac/37852/trim-enabler
TimeMachine 101https://support.apple.com/kb/HT1427
How to relocate system and user data to another drive:
http://support.apple.com/kb/HT4337
http://chris.pirillo.com/how-to-move-the-home-folder-in-os-x-and-why/

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