You can't use APFS as a Time Machine target: Time Machine drives must be HFS+. the SSD is notably faster to perform than an HDD, but for the purpose of doing regular backups, and HDD should be just fine. This answer is for macOS Catalina and earlier versions - Big Sur now can use APFS - see Apple's Types of disks you can use with Time Machine on Mac You can also use HFS+ as before. Perhaps a 120 GB SSD.Īnd as far as the SSD v HDD choice goes. The capacity of this drive could be whatever you felt comfortable with as regarding the sizes of the files you might normally move. In addition, I would also purchase another single drive formatted the same to be used anytime you wished to transfer data and files from one machine to another. That you would use with Time Machine to backup the Mac and restore it if it ever comes to that. I would suggest that a better option would be an individual backup drive for each machine with twice the capacity of that machine, also formatted as Mac OS Extended (journaled) with a single partition. One great concern would be that having backups of multiple machines risks all the backups if something happens to that drive. For example, if each Mac has in internal drive of 1TB, then you would need a single external drive of 6TB capacity, formatted as Mac OS Extended (journaled) and partitioned into three partitions, one for each Mac. If you're going to use it for backups the capacity should be double the drive capacity of each Mac you intend to backup. You didn't say which Seagate HDD you purchased and it doesn't really matter in this case except for the capacity. It's just bad practice and risks a lot if the drive gets corrupted by unintentional misuse. All disk volumes formatted with either the Apple File System (APFS) or the older format Mac OS Extended (Journaled), also called HFS+, can be used as target for. However, I would not use the same drive for data backups that I use for routine file transfers. You say that you will be using this to transfer some data to the MBP which by itself would be fine. And for the purpose you state, that format should be Mac OS Extended (journaled) which will make it available to all three of your machines. Encryption can help protect your information if the drive ever falls into malicious hands.Your MacBook Pro will have no problem reading and writing to the external drive, regardless of how you format it. Click “Use Disk” if you don’t plan to encrypt the drive, and if you do - click the “Encrypt” option in the lower left and enter a password of your choice when it asks. It should be named whatever you named the drive in Step 4. Select the drive you erased from the list of choices. Click Time Machine from the options - if you don’t see the option you can click the Back arrow in the upper left or the series of boxes in the upper left, then select Time Machine. Next click the Apple Menu in the upper left and select “System Preferences” Setting up the external drive to be used with Time Machine: For macOS 13 (Ventura) and later. After the drive erases you can close the Disk Utility window. For macOS versions for 10.6 (Snow Leopard) to 10.15 (Catalina) use Mac OS Extended (Journaled) also referred to as HFS+ when setting up a new backup Use this link for instructions on formatting your drive. Click the Erase option near the upper right of the window, give the drive a name like “Backup” and then choose APFS as the format, and GUID Partition Map as the Scheme. Select the Drive you want to erase on the left side under the headline “External.” In the case of the Samsung T7 portable SSD drive you can choose the option that reads “Samsung PSSD T7 Media” at the top of the list of External. Click the View menu at the top of the screen and select “Show All Devices” or look in the screenshot below for this icon and click it, then select the same option. Once you’ve found it you can press the return key on your keyboard or double click on Disk Utility from the list of results. Search your computer for Disk Utility - the easiest way is to click the magnifying glass (Spotlight) icon in the upper right of your computer and type Disk Utility.Once you have connected the new drive to your computer, follow these steps below. Optionally for a traditional portable hard drive you can also select the format Mac OS Extended (Journaled). If you already know how to use Disk Utility, the format information to choose is APFS or APFS (encrypted) and the scheme should be set to GUID Partition Map. Follow these directions to get your drive formatted for the Mac. Occasionally you may purchase a drive that comes pre-formatted for use on Windows and will need to erase it to use properly on the Mac.
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