Anybody doing a clean install, is it neccessary?

Hi, I've downloaded Yosemite to my mbp and I'm curious if anybody is doing a clean install or letting app do it's thing? I want to do this once and right, as you could imagine!
Thanks,
John

Hey johngrussell,
Thanks for the question. Based on what you stated, it seems like you want to know what you need to do to install Yosemite. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
How to install OS X Yosemite on your Mac
Thanks for using Apple Support Communities.
Cheers,
Mario

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However, if somewhere down the road (say 5 years from now) I decided to opt out of CC will I be able to install CS4?
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Mylenium

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*https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
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*https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Profile_folder_-_Firefox
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IMHO I would classify that as a waste of time and a chance for more problems then it solves.
Just backup and upgrade.
From the sounds of your comments it doesn't sound like you are backing up at the currect time. To me that sounds like a much more serious problem thwen any of the one you are worried about.
For the uograde a backup to DropBox would be worthless. If something goes wrong and your Mac can boot from the disk because of it, how are you going to get to DropBox to recover?
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I am going to do a clean install of Mountain Lion on my iMac, currently running Lion. After I do a clean install of Lion, can I then restore settings and applications from the TM backup made before the upgrade or will this overwrite newer files created by the Lion clean install?
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If I understand correctly a clean install wipes the hard drive which is my intent. Merely installing Mountain Lion over Lion is not going to clear unwanted apps, etc.
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Anybody doing a clean install, is it neccessary?

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