duplicate manager
View and create duplicates of the current image.
The duplicate manager lists all versions of the current darkroom image with their preview thumbnails. Hold down the left mouse button on a thumbnail to temporarily show that version in the center view. Double click to switch to this version and edit it.
The buttons on the top-right allow you to create new duplicates of the current image. You can either create a ‘virgin’ version (with an empty history stack) or an exact duplicate of the current image. For your convenience, you can also assign a name to each version.
The displayed name is stored in the version name metadata tag, which can also be edited within the metadata editor module.