I've been asked to put together a workspace / file server for our design department and I have a few questions. I have two 3TB hard drives that I'd like to use for the storage. I was about to set these up in RAID 1 on an old PowerPC G5 that we have, but I quickly found out that there is a 2TB limit on these machines. Therefore, it looks like I will have to buy an older Intel Mac Pro or a Mac Mini (with an external HD enclosure). I'd prefer to keep costs at or below $1,000. Any suggestions? Also, I need a good way to copy only new or modified data to our off-site storage. I'd like to do this on a nightly basis. Any ideas?