Facet's content-aware layer system is export-compatible with other layer editing tools such as Adobe Photoshop. Layers are exported as raster masks at the same resolution as the original image.
To create a layered export, open the Export dialog either by right-clicking on the canvas or clicking the Facet File menu.
Then in the Export dialog, select "Layered TIFF" or "Layered PSD":
Then click "Export" and you will have access to all of the layers you created.