Apps & Software Mac OS X

How to back up external hard drives with Time Machine on Mac OS X

Even though my Mac Mini has 250GB of very fast SSD storage, I rely on my external Brinell SSD to store my large video files. It frees my Mac’s internal storage and allows me to grab the drive if I ever want to work away from my desk.

Of course, as with any important files, I like to make sure they’re safely backed up! That’s why I’ve started using Mac OS X’s Time Machine feature to back up not only the internal drive, but my external drive too.

Here’s how you can do the same…

  1. Head over to your Mac’s System Preferences menu, the cog icon found on your Mac’s dock back-up-external-drives-mac-os-x
  2. Find the Time Machine icon (near the bottom) and click on it back-up-external-drives-mac-os-x-system-preferences
  3. Once you’re in, click on Select Disk to pick the hard drive you want to save your backups to back-up-external-drives-mac-os-x-select-disk
  4. Next, you’ll need to click on Options… button at the bottom back-up-external-drives-mac-os-x-time-machine
  5. Here, you’ll find a list of hard drives that have been excluded from your Time Machine backups. If your external hard drive is there and you want to back it up, remove it from the list by clicking on the minus button and then Saveback-up-external-drives-mac-os-x-exclude-disk

Now Time Machine will back up both my internal drive as well as the external one to the NAS drive I have connected to the network.

You can never have too many backups 😉

By Fabio Virgi

I'm the guy behind Let's Talk Tech and a travel blog called Fab Meets World. Some people call me a geek, I think they're probably right. I'm fascinated by technology and innovation, love good design and own way too many gadgets for my own good. Want to connect? Get in touch on Twitter and Instagram.