![]() Once it reaches the limitations of that barrier, you’ll see the oldest backups disappear when new ones get created. You can also create a partition that artificially limits how much space Time Machine uses. If you only want the latest options, a 1:1 storage ratio is likely suitable for your needs. That means your oldest backups become automatically deleted. When you have macOS 10.13 or newer, you’ll need to limit storage space on the destination side. Replace XX by the number of megabytes that you want to use. sudo defaults write /Library/Preferences/ MaxSize -integer XX If you have macOS 10.12 or earlier, you have the option to limit the backup size that Time Machine creates by using terminal commands. ![]() You can also pick whatever number best suits your needs, but it should be equal to or greater than what you already have. That means an iMac with a 1 TB HDD setup would want to use a 1.5 TB external drive to manage the compressed files. Unless you don’t want to keep any of your information local (defeating the need for Time Machine), an external storage drive is the best way to preserve the disk images that the service creates.Īs a best practice, your setup should use an external HDD with 150% of the capacity your internal storage offers. ![]() Once you start using Time Machine to create information backups, you’ll discover that the service can begin taking up all of your internal storage. If you want, you can also select to show Time Machine in the menu bar by checking the appropriate box.
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