UCSC supports and maintains an official European mirror housed at the Center for Biotechnology at the University of Bielefeld, Germany:

http://genome-euro.ucsc.edu

UCSC collaborates with the following groups to provide mirror sites that may be used during network or power outages on the UCSC campus.
Please limit the use of these sites to occasions when the UCSC or Official European sites are unavailable.

North American Mirror Sites The Simons Center for Quantitative Biology at Cold Spring Harbor Laboratory (CSHL) maintains an up-to-date site that mirrors most of the more recent assemblies available on the UCSC Genome Browser site: http://genome-mirror.cshl.edu/ This mirror may contain additional CSHL-generated annotations in addition to the standard UCSC tracks. Many thanks to Adam Siepel at CSHL for providing this mirror.

If you are interested in mirroring the UCSC Genome Browser at your site, see our Mirror Procedures. A license is required for commercial download and/or installation of the Genome Browser binaries and source code. No license is needed for academic, nonprofit, and personal use. To purchase a license, see our License Instructions, or visit the Genome Browser store.

Mirror site questions may be directed to the mailing list genome-mirror@soe.ucsc.edu. Messages sent to this address will be posted to the moderated genome-mirror mailing list, which is archived on a SEARCHABLE PUBLIC Google Groups forum.

Subscribe to the genome-mirror mailing list.