1. While you can often install the software *application* on an external drive, most applications have other content that gets installed in the system folder. As such, you can't really do what you're trying to do, no.
2. I don't really understand the question. You can certainly use a full "Backup - all files" as your startup drive, if that's what you mean, if the internal goes down. This is explained in a lot of detail in the User' sGuide.
3. I have no way of answering this. You sort of have to look at your situation and decide how big your partitions should be...
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--Dave Nanian
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