How do I prevent OS X from booting from the backup of my main HD?

Hi all,
On a MacPro tower I have set up daily complete backup of my Macintosh HD, which is made to another internal HD. Unfortunately, on startup the computer seems to decide at random whether to boot from my Macintosh HD or from the Backup HD. I want the backup copy to be bootable of course, but not to take precedent when I regularly bootup. I have changed the backup software, which has made no difference. I am now using Integro Backup Assistant. Also the HD are named differently to avoid any obvious confusion.
Any clues on how to permenantly set my startup disk would be much appreciated.
Thanks,
Tommie

Hi,
In System Preferences > Start Up Disk is one device set as the Start Up Disk ?
It may not be clear just looking at the left to right scroll area (depending how many drives and Partitions) but selecting one can often help.
At Start Up the computer looks for a valid Boot Disk.
If it does not seem to be set it is supposed to go through some checks to find out which one to Boot from. Most occasions it will pick the last Drive/partition that it was Booted from. However the order in which the Internal Drives are connected to the system may also pay a part, particularly of the Current required Boot drive is not the original hard drive (Or at least in it's physical place, cable connection-wise).
Also Click on the desktop and open Mac Help (Help Menu in the Finder) and see what that has to say.
11:30 AM Thursday; August 26, 2010
Message was edited by: Ralph Johns (UK)

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