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Originally Posted by
Dr Millmoss 
I does, but the old one is automatically deleted.
It kind of sort of does something similar to an archive and install - but it's not an archive and install.
For example, it automatically keeps patches so you are at the same point release. While 90% of the time that is probably fine, what if a certain point release caused you a problem and you need to roll back? You used to be able to do so pretty easily with an archive and install. Now you have to basically do a clean install of the OS and then manually run the migration assistant. Certainly not as easy or convenient.
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The "clean install" is mythical because no such option actually exists.
Huh? So it doesn't exist if there isn't an option for it?
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Maybe you think I'm just being pedantic
I know your are being pedantic

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but as I said before, I pity the poor novice user who gets this advice because they will be confused if they try to do it. That's only my first argument against the so-called clean install.
I dunno - clean install sounds pretty drastic to me. I don't know of many novices that would attempt something like that if they aren't comfortable with it. Maybe the novices you know are just more adventurous then the novices I know. And even then, hopefully before anyone does any major upgrade with an OS they at least have a backup. With TimeMachine this is now pretty darn simple (attach an external drive and either answer yes, or go into preferences and turn it on).
You can format a hard drive, perform a clean install of the OS and then use the migration assistant to move your stuff back - pretty easy to do a clean install on a Mac. Certainly easier then on Windows.
Having said all that, the option for Archive and Install as they used to offer is still useful and I'm sad to see it is no longer available.