The FreeNAS distribution is tailor-made for installation in a small office environment. It is an extremely low-resource network storage system that you can administer through a Web browser, but it supports high-end features like automatic backups, replication, LDAP or Active Directory authentication, and seamless file-sharing over NFS, CIFS, AFP, and even FTP and TFTP. The latest release — version 8.0 — is just a few weeks old, and it is the perfect time to take a look.
more at the source: http://www.linux.com/learn/tutorials/464109-freenas-80-simplifies-storage
Have you tested it? What do you think?