exFAT works with both Windows and Mac but does not support Time Machine backup.macOS Extended Journaled (a.k.a HFS+) works with all Mac OS versions and will not work with Windows.The catch is if you forget the password, you’ll lose the data. Encrypted means data stored on the drive can be encrypted, use this if you intend to store sensitive data on the drive.Case sensitive means files of the same name but different letter cases (i.e., MyFile.txt vs.APFS only works with Sierra (10.12) or later. ![]() (For this example, I named the new partition Time Machine, used Mac OS Extended (Journaled) as the format and 300GB as its size.) Then click on Apply.īy the way, if you’re curious as to what file format to use. Click on the Plus (+) to add another partition to the drive, then pick the Name, Format, and Size for the new partition. Select Name, Format, and Size for the new Partition.Ģ. Note: Doing this will erase all drive content, so make sure you’re OK with that. For that, you turn a single hardware drive into two different volumes (or logical disks) and use one for Time Machine. The idea here is to create a separate partition on the external drive and use that partition exclusively for Time Machine backup. Limit Time Machine backup size of an external drive Instead, you’ll need to limit the storage space at the destination side, be it the external drive you plug directly into your Mac or a Time Machine-supported NAS server.īy the way, since you make changes to the backup destination, this method will work on all macOS versions. If you run the latest macOS (10.13 Mojave or newer), the command above won’t take effect. Sudo defaults delete /Library/Preferences/ MaxSize Limit Time Machine backup size in all versions of macOS If you want to revert to the default value (no limit), run this command: And that’s it! From now on, Time Machine on that Mac will automatically delete old backups to make sure it uses no more than 300GB. You’ll be likely prompted to enter your account’s password, so do that and press Enter again. Sudo defaults write /Library/Preferences/ MaxSize 307200
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