With Mountain Duck 5, a new storage-independent versioning option is introduced for protocols with no support for file versioning such as FTP/SFTP, WebDAV, and OpenStack Swift. Safeguard against potential file loss with custom versioning. Stash changes to a file in a versioned folder on the server.
The custom versioning option can be enabled in the bookmark configuration or by default in Preferences → Versions tab.

Use the context menu Info → Versions to retrieve the file history where previous versions can be previewed, deleted or restored. Alternatively manage previous versions stored in the folder named .duckversions
adjacent to the file.

More information on the settings can be found in the documentation.