Your subconscious is identifying the multiple personality types or point of views residing within you that you may or may not be aware of. It's as simple as the change of mood, snapshots of your personality at different times in your life, or different reactions to problems you are currently dealing with in real life.
If the clones or duplicates continue to grow in number you are adding more scenarios or widening your point of view of a problem you hope to solve.
The other details of the dream can give you deeper insights into their meanings in this dream. Are the clones taking over? Are they causing chaos? Are they forming and army? Are they helping you achieve something or against you? How do you feel about them? Happiness, fearful, or are you overwhelmed?
If you feel overwhelmed by it, your subconscious is trying to tell you to simplify your strategies.
Having too many points of view in real life could be what your subconscious is warning you of.
If you are making copies at a copier, you are forming new variations of looking at a present situation. This is usually concerned with professional careers since at an office is where you would find a copier.
If the clones are a source of entertainment or hilarity, your subconscious is pointing out that you should enjoy your diversity.
