If you’d like to save some space (and a bit of time, especially on your initial backup) with your Time Machine backups:

  • Open a Finder window and go to your Mac’s hard drive
  • Open System Preferences > Time Machine, then click Options
  • Drag the System folder from your Mac’s hard drive into the “Exclude these items from backup” section

OS X will prompt you to exclude other related items, including system applications. You probably don’t need those core items since they come preinstalled in OS X anyway, and your initial and potentially future backups won’t take as much time.

You’ll save space on your Time Machine backup drive, too. Once I enabled this option, the total excluded file size was 26.82GB.

Update

Good point from Kevin Miller in the comments:

A very important caveat: once this is done, you can no longer restore a bootable system from scratch using Time Machine. You can only restore individual folders.

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