Cyberduck Registration Key

: In the Preferences window, navigate to the "Registration" tab.

Which you connect to most often (SFTP, AWS S3, Google Drive, etc.)

Cyberduck is a premier open-source cloud storage browser for Mac and Windows. It simplifies file transfers across FTP, SFTP, WebDAV, Amazon S3, and Microsoft OneDrive.

: If you lose your key, you can recover it by entering your registered email address on the Cyberduck Help Recovery page Manual Placement

Yes, Cyberduck is free to use. However, a registration key provides additional benefits.