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I am about to install OSX Mavericks in an iMac I have. I would love to make a clean install (creating the bootable USB with that complex procedure).

I was thinking about copying folder by folder but thinking about iTunes, iMovie and iPhoto makes things more complicate as they are stored in the library folder and it can carry more than one problem I guess.

I was wondering if that "clean" install will again become "dirty" if I restore everything with the copy I have in TimeMachine.

Would that also transfer preferences and things which could interfere with the new installation?

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I wonder if you are looking to replicate things from when OS X has three ways to install. Erase, archive and upgrade? That's no longer the case so you might be fine just picking to hand migrate things or let the one migration script do it's work. – bmike Dec 24 '13 at 14:30
up vote 4 down vote accepted

It depends on your definition of 'dirty' — indeed, restoring from Time Machine will restore many preferences, but won't restore any system files, as they will come from your fresh OS X install.

If you want the cleanest possible OS, manually copying the files you need will be the best option — even though it's time consuming, you'll only get what you need.

The OS itself will remain 'clean' if you restore from Time Machine since the files will be kept from the OS X install and won't be restored from Time Machine.

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Thanks for your answer! I will probably use TimeMachine then! – Steve Dec 24 '13 at 16:15

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