Many of these perplexing problems can occur over the years of using your Mac. As you upgrade systems and applications, debris gets left behind, files become overly large, causing slowdowns, and some files used by the system or apps can become corrupt, slowing things down or even preventing your Mac from operating correctly. Finding these bits of file debris is almost impossible. If you're having these kinds of problems with your Mac, then a good clean sweep, as it were, may be just the remedy you need. No matter which installation method you choose, before you proceed, back up all of your data.
A recent is the bare minimum you should have on hand. You should also consider. That way if anything terrible should happen, you can quickly recover by booting from the clone, and be right back where you started, without taking the time to restore the data from a backup. A clone is also an advantage when it's time to migrate some of your information over to your new installation of OS X Yosemite. Yosemite's works with cloned drives, and lets you easily move data you may need.
![Mac Mac](/uploads/1/2/5/4/125498075/716083779.jpg)
![Unsupported Unsupported](http://www.intego.com/mac-security-blog/wp-content/uploads/2014/11/install-yosemite-old-mac.jpg)
Nov 4, 2017 - You'll be happily greeted by a familiar (yet older looking) version of the repair utilities where you can restore from Time Machine, install OS X.
What You Need for a Clean Install of OS X Yosemite. Launch the Mac App Store by clicking its icon in the, or by double-clicking the App Store application located at /Applications. To find OS X Yosemite, click the Apple Apps link under the All Categories section of the right-hand sidebar. You may also find OS X Yosemite featured at the top of the All Categories section, or in the Featured products banner section of the Mac App Store. Once you locate the OS X Yosemite app, click its download button. You may be asked to sign in if you haven't already done so.
The Yosemite app file is in excess of 5 GB in size, so you may want to find something else to do while you wait for it to finish downloading. Once the download is complete, the OS X Yosemite Install app will launch on its own. Do not proceed with the installation; instead, quit the installer by selecting Quit Install OS X from the Install OS X menu. Create a Bootable.