
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. 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 Save. Time Machine will start backing up your hard drive.

You'll need to do this immediately after clicking Restart Now and hold them until the recovery screen appears.
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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.

It frees my Mac’s internal storage and allows me to grab the drive if I ever want to work away from my desk. It seems they formatted the drive to the Mac format, but I have no way to access the data, at least I think I saw there were ways to view and copy the data from the drive to my computer using third party software, but there. 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. I had information from a broken Mac backed up at Best Buy, but because my Mac broke, now I only have a Windows computer.
