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The background is dark because the amount of light hitting you backdrop is far less than the amount hitting your model. There is a HUGE F-Stop difference.
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This is true, but when you said that moving the light back could still help a little, you were wrong. Moving the light back will greatly decrease the amount of light hitting the background due to the inverse square law.
What you really need to do is get some light on that background. Meaning, if you want a professional looking image, you need to not only set up a light on your model, but also a light on your background. The background should always be treated as a seperate lighting situation.
This is why it's less of a pain in the ass to find a situation where there is enough existing light, like bright daylight. Or, you need to move your model closer to the background, and the light closer to the background... however, this usually isn't desireable due to shadows, and having the background as part of the image.