Nexus can be configured to download POMs and artifacts from a remote repository's mirror. Nexus can also be used to configure a list of mirror URLs for a hosted repository. When Nexus interacts with a mirror, it offloads the bulk of the bandwidth to the mirror when it downloads artifacts and POMs from the mirror. At the same time it is saving bandwidth, Nexus is careful to download secure artifacts such as the PGP signatures, MD5 checksums, and SHA1 checksums from the "canonical repository URL".