AFS (Andrew File System) is a distributed file system that enables cooperating hosts (clients and servers) to efficiently share file system resources across local and wide area networks. At Stanford, AFS is easily accessed via the Web and serves as the campus-wide file system. AFS is distributed among eleven servers and provides two terabytes of usable disk space, which is backed up nightly. This stable, distributed system is where the University's main web site and linked files are hosted. It supports storing public data on “AFS at Stanford” or restricted or prohibited data on “Secure AFS at Stanford”.