A Happy Computers Discovery Cartridge will backup ALL discs, including protected ones with funny things going on in the sectors. These include Dungeon Master and Oids, and a number of others. You can also create images of the discs too which can be saved to disc.
Ijor is the person on here who knows all about them, and images ALOT of discs. viewtopic.php?f=15&t=7583
The software is also floating about too, yet some of it is faulty. So beware on that front.