The canonical server for the IF-Archive is https://ifarchive.org/. This should have enough bandwidth for all legitimate use. The old https://mirror.ifarchive.org/ address will continue to work, but it's now identical to the main server.
For many years, a group of volunteers hosted mirrors of the Archive. We are grateful to them! The most recent mirror list is shown here.
Note: we do not guarantee that these mirrors are active and up to date. They are maintained by individual volunteers and we don't check them regularly. Please contact the maintainer listed on each site if you find problems.