Hi Christian,
the first URL (.../releases/luna) should provide all features that need to be mirrored to provide all features that are required during the installation of the ABAP Development Tools.
The features you need to mirror are listed in the installation guide attached to the current/2.41 release note (section 6.1.3, Table 5). I never mirrored the whole luna or kepler Update Site. That's a lot of data. In the attached xml you can see how I did the selective mirroring.
Regards, Felix