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Using Migration Assistant undermines the entire process of a “clean install.” It’s the worst way to install a new version of OS X because it simply restores (i.e., “migrates”) all of the crap that has built up on your hard drive from the previous version of OS X on you Mac, especially in the User Library (e.g., vast amount of cache garbage, old, corrupt. Now you’re ready to manually move your files and data back to the Mac, or start as new with nothing on the Mac, whatever works for you. No files, no data, nothing will be on the Mac except for what comes with OS X El Capitan, that is what a clean install is for. When finished, OS X El Capitan will boot into a brand new clean install, running through the initial OS X setup process on the Mac as if the Mac was brand new. Completing a fresh installation of OS X 10.11 can take a while, so be prepared for at least 30 minutes to several hours, depending on the speed of the drives in use. That’s it, OS X El Capitan will perform a fresh installation on a now empty hard disk volume that you just formatted. Agree to the terms, and choose “Macintosh HD” (or matching whatever the name you formatted the drive to) from the list and click on “Install”.Now choose “Install OS X” from the menu, click Continue.
Performing a clean install will erase the Mac and you will lose any data you do not save to an external volume Be sure to back up your important files, pictures, data, or whatever else – do not skip this. Alternatively, perform your own backups manually.
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How to Clean Install OS X El Capitan & Start Fresh If you don’t know what you’re doing with a clean install, and you have not made backups, don’t try this, you will lose data. This is generally best for advanced users. If you are choosing to do this, you need to backup your data yourself, as erasing the volume and performing a clean install means nothing is coming with it. Remember, a clean install will erase everything, format the hard drive, and then install OS X El Capitan with nothing else on the Mac.
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If you have already installed OS X 10.11 on the Mac, you can download it again and create a boot installer with these instructions. You will need to have made a bootable OS X El Capitan installer drive with a USB flash key to perform a clean install.
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Click Recover again to get back your valuable pictures.While most Mac users are well served by running the normal update process to OS X El Capitan after it has been downloaded from the Mac App Store, this guide is for users who want to start fresh.Preview the recoverable photos by filtering on Pictures and make your selections.Click Recover to start scanning for lost images.