Write the drive as “MacOS Extended (Journaled)” using the “GUID Partition Table”. Open Disk Utility with Spotlight, or by heading to Applications > Utilities > Disk Utility in the Finder.Ĭlick your new hard drive in the left panel, then click “Erase.” Make sure you’re not erasing your old Time Machine drive before doing anything. It’s likely not formatted properly, so we need to use Disk Utility to get things just right. Go ahead and plug in your new hard drive. Step Two: Connect and Format Your New Drive It will slow you down and potentially introduce conflicts.ĭone? Good, let’s keep going. It regularly won't hurt the computer, but it may corrupt that disk.The reason is simple: you don’t want a new backup starting while you’re migrating your files. A MacBookPro will do it (I've done it for years on client systems and my own for testing and troubleshooting) but you have to be careful to not accidentally unplug the boot-drive when the system is on and running. The only caveat I'd look out for is the inherent risk of using an external drive to boot the computer. Ultimately Time Machine is just going to ask where it should restore the backup and I see no reason why an external disk formatted as HFS+ wouldn't show up in said listing. If your Time Machine backup is of one of the newer versions of macOS you could be able to boot the computer from the Time Machine backup directly and complete some of the steps outlined above.
Simplest way to do that is connect the drive to the computer and either using the recovery partition or downloading the macOS installer from the AppStore onto the system you'll be able to target the external drive to install the OS (you may even have the option of restoring a Time Machine backup directly from the recovery partition. Its not hard to do honestly, but again you'll have to install the OS. You would be able to do what you're looking for, but you may have to install an OS on the external drive for Time Machine to recognize that as a destination.
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