ResourceManager question?

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1. is there any difference if I have one ResurceManager for everything that is a resource in my engine, or to have like one resource manager for each?

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2. well, what is the difference between using a ID for all resources then call he ResourceManager for the data, or using pointers directly to the data?!

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3. what is the benefits of having one TextureManager of itself instead of use the ResourceManager?

4. if I have a stand-alone TextureManager and then make that one abstract and implement one TextureManagerGL and one TextureManagerD3D or something like that what would be the benefits of that?

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class TextureData
{
};

class TextureData_DX9 : public TextureData
{
    LPDIRECT3DTEXTURE9 m_Texture;
};

class TextureData_OGL : public TextureData
{
    unsigned char * m_Texture;
};

class TextureManager
{
    std::some_storage_class < TextureData > myTextures;
};