How to stop apps on an external drive from launching or showing up in menus

I use SuperDuper to keep a bootable back up of my main drive. The problem is those apps show up in the list of apps that can open a particular file, and if its the same version on the main drive and the external, you'll often launch the app from the external drive.
This is a especially a problem when using the "open with" feature. Is there a way to make sure it only reads apps installed on the main drive.

Hi,
sorry to hijack, but I have a similar question you may be able to help with.
I too keep a Super Duper clone, but on a second internal drive - I often use the "Open With" contextual menu option to open files, and it bugs the **** out of me that I have to wait several seconds for the second drive to spin up - freezing the Finder in the process. What's even more annoying is that I also use the contextual menu to move things to the trash, which invariably stalls on "Open With" because it's above it in the menu.
Do you know of any means of solving this increasingly annoying problem. I know I could simply unmount the second drive, but that interferes with Super Duper's scheduled backups.
Any suggestions would be appreciated
Regards

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How to stop apps on an external drive from launching or showing up in menus

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