This item is valid for all items that can save patches. The menu item name reflects the type of device selected (for example "export Redrum Patch").
Even though the device settings are stored in the song, you may want to save any settings you have made for a device as a separate patch file. This allows you to use the patch in other songs, and lets you try out other patches in your song without risking to lose your sound.
The different types of patch files have different file extensions.
These are ".zyp" (Subtractor patch files), ".smp" (NN-19 patch files) ".drp" (Redrum patch files), ".xwv" (Malström patch files) and ".sxt" (NN-XT patch files).
If you have selected a patch, modified it and want to save it with the modifications, you could either save a separate, modified version of the patch (with a new name) or simply overwrite the old patch file on disk.
As usual, you will be asked whether you really want to replace the existing patch file.
You can save a patch under the same name and location (without having the save dialog appear) by holding down [Alt] and clicking the floppy disk button on the device panel. Note that this overwrites the original patch!