Changing volume's Ownership selection ?

I have an external FW hard drive that I've partitioned. I use one partition for a duplicate/clone of my Mac to boot from in emergencies and the other for daily backups.
I understand that a boot volume must not have "Ignore Ownership" selected.
My question is: can I change that selection back and forth and still have a bootable volume?
I'm almost 100% sure the partiton was set to not Ignore Ownership. However, during and overnight duplicating to that volume, it was reported in the log that the volume did have Ignore Ownership selected. So...can I just change it so Ignore Ownership is not selected and all will be well for a bootable volume? Or do I need to erase the volume and clone again with Ignore Ownership not selected? I'm trying to understand whether the permissions are always there and just made active or inactive or if the Ignore Ownership actually changes permanently the permissions on that volume.
Thank you
Powerbook G4 Ti   Mac OS X (10.4.4)  
Powerbook G4 Ti   Mac OS X (10.3.9)  

Hi Baltwo,
I too would like to make a back-up to a 600GB external (with the ignore ownership unchecked) then use the disc for other purposes.
I followed your link to the article but, though saying ignore ownership should be unchecked for a back-up volume, it didn't cover the scenario of making a bootable back-up with the ownership unchecked. Re-checking, using the disc for other work, then unchecking again to use as a boot disk.
Does the actual unchecking/checking of the ignore ownership box actually change/corrupt already archived volumes or is it just a temporary override?
any info on this recived with thanks!
Julian

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