
Start up or reboot the Mac and hold down the Command+R keys simultaneously, this will boot into the Mac OS Recovery Partition.Connect the Time Machine backup drive to the Mac if you have not done so already.Restoring and Recovering an Entire Mac System from Time Machine Backups If you only want or need to re-install OS X, you can use Internet Recovery for that, which will replace only the system software portion, without any personal files or applications. Note this aims to recover and restore an entire Mac, including all files, all applications, and MacOS / Mac OS X system software, everything that is made from and contained within a Time Machine backup.

Nonetheless, it’s good to understand how this process works, so if you ever find yourself in a situation where you have a new hard drive (or even a new Mac), or you just need to perform a complete restore of a previous backup, this tutorial will cover that restoration process of everything with Time Machine. To be perfectly clear, restoring Mac OS X and all of your personal stuff from a previously made Time Machine backup is really only needed in extreme situations, and fortunately this is not something that is frequently required or necessary. Typically this happens when either a hard drive fails or a Mac OS X system update goes completely awry, but if you have set up Time Machine backups on the Mac like all users should, then you will discover that restoring an entire systems hard drive from that Time Machine backup is really quite easy. While Macs have a great reputation for being stable and rarely experiencing major issues, the reality is that sometimes things can go wrong.
