But if you want your vault to be more secure, select 256-bit AES encryption. Apple recommends the 128-bit AES encryption choice because it makes the disk image very secure, without being too slow. To encrypt the disk image, select an Encryption method. Leave the Format as Mac OS Extended (Journaled). Type a space after the number in the Size box and then type KB, MB, GB, or TB. Select where to save the disk image file, enter a Name, and specify the Size for the disk image file. Be sure to keep the “.dmg” at the end of the file name.
To create an encrypted disk image file, go to Applications > Utilities in Finder and double-click Disk Utility.Įnter a name for the disk image in the Save As box on the dialog box that displays. Today we’ll show you how to create your own disk image file using the built-in Disk Utility app and use the disk image file to securely store files and folders. dmg files can be stored on your Mac and anywhere like Dropbox, Google Drive, OneDrive, or on an external drive.
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