![]() the SSD is notably faster to perform than an HDD, but for the purpose of doing regular backups, and HDD should be just fine. 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. Depending on how you’ll use a given drive, both the APFS and Mac OS Extended can be viable. 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. The main difference between APFS and Mac OS Extended is that the former is faster and more reliable, whereas the latter is compatible with older macOS releases. 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. ![]() 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. Your MacBook Pro will have no problem reading and writing to the external drive, regardless of how you format it.
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