Quote:
Originally Posted by asleyam
If you want to run OSX from an external drive you need a clone of the internal mackintoshHD. ...
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You don't need to clone the internal HD to make a bootable external hard drive. Simply choosing the external hard drive via the install works fine. However it makes a clean install with none of the apps or data you may have on your internal hard drive. For the purposes of this discussion, i.e. making an external drive for running a couple of programs, that might be preferable.
You probably don't want to run the external drive time machine to the same disk that you use for the internal drive. That could get a bit confusing. I turned time machine off on my external drive version. No real need to back up anything since it is purely to run a couple of programs and all my data is already saved elsewhere.