"open with" and Spotlight cluttered with different versions of files/apps The app versions are not even in my Applications directory anymore. Is there something wrong or can I edit settings for that somewhere? It seems as if my backup drive is indexed as well. How to avoid that?

See screenshots:
To disable indexing of the back up drive

Open Spotlight in System preferences

click on Privacy Tab,

drag the drive in question in to here

or use the +