Mountain Duck gained the ability to mount remote volumes as read-only and forbids writes to the remote server on the operating system level. This will pose most useful to users mounting productive environments and will want to make sure nothing is written to the server but files are only readable.


Read Only Mount Option

Deep Storage

Support for Spectra BlackPearl Deep Storage Gateway (Spectra S3) is available with Cyberduck 5, allowing users to move data to tape library storage managed by Spectra S3 interface fast using multiple connections achieving 1000MB/s with a 10GbE network link.

10GbE Transfer

Refer to the wiki for usage instructions.

Spectra Logic Solidifies Hybrid Cloud Offering with Cyberduck Integration

Spectra BlackPearl integration with Cyberduck open source tool enables unlimited choice in public cloud storage and private cloud local storage in one platform

BOULDER, Colo.—July 20, 2016— Spectra Logic, the deep storage experts, today announced the certification of the Cyberduck open source client software tool with its BlackPearl™ Deep Storage Gateway. The Cyberduck universal file and object storage management tool combined with Spectra® BlackPearl enables fast file transfers between primary storage, local tape and disk-based private clouds, or to any public cloud provider.

The integration of Cyberduck as a certified BlackPearl client gives users the power of direct drag-and-drop data moves between BlackPearl objects that reside on Spectra’s ArcticBlue™ disk or tape libraries, and multiple online cloud object stores. Using Spectra’s private cloud ecosystem means that infrequently accessed data can be archived to disk or tape for pennies per gigabyte, reducing the storage and recall fees associated with a pure public cloud strategy, now with a simplified and familiar Cyberduck interface.

Cyberduck integration provides the ability to seamlessly and simply move data between previously disparate storage platforms including local file systems, remote FTP systems, and a host of public cloud storage, including Amazon S3, Amazon Glacier, Google Cloud Storage and Drive, Microsoft Azure, Rackspace Cloudfiles and iRODS. Each system can be loaded in its own Cyberduck window and data moved between any of them.

“Cyberduck provides a wonderful interface to remote files using standard and cloud API protocols,” said beta user, Mike Warfe, Assistant Director, University Technology, [U] Tech, Research Computing and Cyberinfrastructure, Case Western Reserve University. “The integration with the Spectra Logic BlackPearl has enabled our researchers at Case Western Reserve University to have an additional option for storing their data on-premise, instead of the public cloud. This provides value through leveraging our campus bandwidth, and the university’s cyber infrastructure.”

The new Cyberduck BlackPearl integration simplifies data management. BlackPearl uses internal management policies for different storage devices, enabling the system to write data intelligently to different tape libraries, tape partitions, and nearline and online disk. This management feature, called Advanced Bucket Management (ABM), allows BlackPearl to control where and how data is written.

Cyberduck version 5.0 is a standalone application for both PC and MAC platforms and can be downloaded directly from the Cyberduck website or Spectra Logic’s Developer page and is free for Spectra customers.

“End users turn to the cloud to capture a backup copy for disaster recovery, or to create genetic diversity in their backup environment where multiple copies of data are preserved on different mediums in separate locations,” said Matt Starr, Spectra Logic’s CTO. “The Cyberduck integration gives customers the ability to move files quickly to a deep storage platform with a tool they are already familiar with, creating a flexible and powerful cloud strategy.”

Learn more about Spectra Logic’s Cyberduck client integration offering in our joint solution brief and video.

More options for Server Side Encryption in S3

Server side encryption (SSE) for stored files is supported and can be enabled by default for all uploads in the S3 preferences or for individual files in the File → Info (⌘-I) → S3. AWS handles key management and key protection for you. Cyberduck previously supported server-side encryption using SSE-S3 where files are encrypted with a default key managed by S3 using AES-256.

Cyberduck 5.0 and later now supports the use of private keys used for servers-side encryption of files uploaded to S3 managed in AWS Key Management Service (KMS). The dropdown list in the Info panel allows to choose from all private keys managed in AWS Key Management Service (KMS). This requires the kms:ListKeys and kms:ListKeys permission for the AWS credentials used to connect to S3.

AWS SSE-KMS Private Key Selection

You can give it a try in the latest snapshot build.

Support for Backblaze B2


Cyberduck 4.9 adds support for Backblaze B2 Cloud Storage. This includes uploading large files, for files up to 10TB.

Backblaze B2 Cloud Storage works similar to Amazon S3 or Microsoft Azure, allowing you to store unlimited data in the cloud. But does it for 1/4th the cost.

B2 Cloud Storage support in Cyberduck gives you convenient access to low priced redundant and unlimited storage from your desktop.

We are hiring!

Help shaping widely used products in an open source development environment!

We are looking for an experienced Java enthusiast to join our team as an employee or long term freelancer. You help us to drive the integration of cloud storage services into Cyberduck & Mountain Duck and to build up new products from scratch using the latest technologies.

Please refer to our job advertisement for more information.

The cloud on your desktop

We shipped Mountain Duck for Mac & Windows after fixing tons of issues during our private beta to the Mac App Store and for sale from our website! We are excited to get the first positive reviews from users:

(…) The app helps web developers have a less crowded workspace and is sure to make the overall web development a bit easier and faster. –– Softpedia review of Mountain Duck for Windows

(…) All in all, Mountain Duck is a handy utility that could prove to be invaluable for users who commonly manage multiple remote storage servers, as it enables you to mount them as local volumes, and browse their contents or transfer files using Finder. –– Softpedia reviewing Mountain Duck for Mac

Great software. Saves a lot of time. Perhaps you can tell Apple how to implement ftp functionality into Finder as for the last 15 years they seem not to be able to do that. –– MacUpdate comment on Mountain Duck for Mac

(…) Enter this app. It mounts file shares like SFTP, Sharepoint and even my Amazon cloud storage share just like mapping a network drive. Best of all I can use Finder to navigate through the file structures. (…) –– Mac App Store Review

Screenshot Mountain Duck Mac 1440x900

Mind the adware

Adware installers from download sites have become ubiquitous and are now the norm rather than the exception. We therefore urge users to refrain from downloading Cyberduck from download sites such as, or which are or have in the past distributed adware (advertising-supported installers) without our consent. Always download software through the Mac App Store or directly from the developer’s site.

We are also sending out emails to these publishers urging them to stop wrapping our software with an adware  concealing installer and additionally urge Apple to revoke their Developer ID certificate used to distribute the installers (radar://23550056) and/or add the installers to the list of known malware by Gatekeeper.

Update: MacUpdate has removed the adware installer in response to our email claiming the “Cyberduck listing will not be part of any future tests we do with app downloads”.

Update: has removed the adware installer in response to our email confirmed with “ installer has been disabled for this company profile”.