![]() Now choose the destination drive to recover to, usually this is “Macintosh HD”, then click on the “Restore” button and let this complete – this will downgrade from OS X El Capitan to whatever version of OS X and the associated backup you chose.When you have selected the backup you wish to revert to, click on “Continue”.At the “Select a Backup” screen, choose the backup you wish to restore to, focus on the ‘Backup Date & Time” and “OS X Version” listings to make sure you are selecting the proper backup, keeping in mind the following:.Select the Time Machine drive from the “Select Backup Source” screen.When you see the “OS X Utilities” menu on screen, choose “Restore from Time Machine backup”.Reboot the Mac and after you hear the start chime start holding down Command+R to boot into Recovery Mode (you can also hold down the Option key and boot from a El Capitan installer drive).Connect the Time Machine drive to the Mac that contains the backup of a prior OS X installation.How to Downgrade OS X El Capitan Back to OS X Mavericks, Yosemite, or Mountain Lion with Time Machine Essentially what you are doing with this method is restoring from a prior Time Machine backup of a prior OS X install. You should also manually copy any new files or important data or documents that have been created from the date of the last backup from the prior OS X version and now, since you will lose those files in this downgrading process. Before getting started: You should finish a new backup before starting this process.
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