Which mirror sites exist for dblp?

Currently, there are three equally relevant servers maintained by the dblp team:

All three sites run on their own server setup in a different location. The data on all three sites is sync with each other (within a margin of up to some hours necessary to produce a new build and to propagate changes).

In the past, a number of externally maintained mirror sites existed, which are now no longer in sync with the current dblp dataset.

maintained by Schloss Dagstuhl LZI at University of Trier