Or you could buy a Synology like I did and forget paying rent per user. Integrates with LDAP. Comes with a ton of useful software but I bought it mostly for CloudStation and a local file server for large files/collections we didn't want to keep on our workstations or laptops. CloudStation provides remote file sync which we are using to replace Dropbox. Also you can hook up your IP security cams, run a mail server, ftp, iTunes server, whatever... nice web based UX. I'm thinking of buying another smaller one for home.