Protect Files in the Cloud

Keeping data online has become a norm these days, however we all have concerns about cloud security – how safe is our data ‘out there’? There are several ways to ensure secure cloud storage, and one of them is an encrypted disk image, which requires a password to open and become available. Moving files to or from it is no different from moving files to and from a non-encrypted disk image.

Protect Files in the Cloud

Here we will explain how to create an encrypted disk image with the help of Disk Utility OS X and keep it in safe cloud storage.

How to create an encrypted disk image

  1. In Finder click Go -> Applications -> Utilities, open Disk Utility.

  2. Choose File -> New -> Blank Disk Image or use the New Image button and go to Creating a New Blank Image section.

  3. In a New Blank Image screen displayed:

    • Enter a name in the Save As field, this name will be used for .dmg file.
    • Change the save destination, if required.
    • Enter a name in the Name field, it will be displayed when you open the disk.
    • Select a Size of the image file from the drop-down menu.
    • Choose an Encryption option – 256-bit AES is recommended for
      Mac OS X 10.5 and later versions, while 128-bit is for earlier versions.
    • Select an Image format – you can choose either a set amount of space or ‘sparse disk image’ if you do not want to occupy more space than it is actually required.
    • Click the ‘Create’ button.

  4. Enter and verify a secure password when prompted and click OK. If you uncheck ‘Remember password in my keychain’, nobody will be able to get your password by checking your keychain. Be warned though, if you ever lose your password to a disk image, there is no way to retrieve data stored there.

How to keep an encrypted disk image safe

To make sure your encrypted disk image is safe and available to you at all times, upload it in a secure cloud with the help of CloudMounter. This application supports Google Drive, Dropbox, Amazon S3, Microsoft OneDrive, etc.

Store your files on one of these services and mount the disk directly from the cloud. Once you unmount the encrypted disk image and exit CloudMounter, there will be no trace of the encrypted data left on your computer, all of it is under cloud protection.

Even if your cloud account gets hacked, there is no way to get an unauthorized access to the encrypted disk image there – all your files are encrypted.

Moreover, CloudMounter added their own data encryption functionality in the latest update. Now it can protect the data stored in the cloud accounts with a master password.


Requirements: OS X 10.10+ , 13.1Mb free space
Version 3.4.546 (8th Sep, 2018) Release notes
Category: UtilitiesApplication