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This goes up if you plan on having a lot of huge files like 4K video or RAW photos.

So if you have a 500GB MacBook Air, you should look for an external drive in the 1TB to 2TB range at a minimum.

The general rule of thumb is to get an external drive two to four times larger than the internal storage. What hard drive should I get?įirst, you will want a drive exclusively for Time Machine purposes, as it’s going to fill up rather quickly depending on your system’s size. We will also cover how to use a NAS device as well as another Mac as a Time Machine backup. If you have a recent MacBook, you’ll either need a USB-C/Thunderbolt SSD or a dongle that can connect to a USB-A device. Any old hard drive will do as long as you can plug it into your device. To make a backup with Time Machine, you need an external drive. Here’s a breakdown of everything you need to use Time Machine, from backing up your latest version to retrieving lost data.