Our design studio has a Mac Pro used as a file server which stores copies of all our finished jobs. We are looking at the best way of storing an off-site copy of this data (about 2TB and rising). Currently we burn copies to disc and store off-site but this is proving too time consuming plus if any changes are made to files on the server these aren't updated on the off-site disc copies. One solution I am considering is attaching an external RAID drive to the Mac Pro and backing up to that. If this RAID had hot-swappable drives I am assuming I could keep an extra set of drives off-site and rotate them every week or so. Does anyone have an experience or advice on using a similar set-up?