I am an application developer in a small company. Recently, my boss asked me to setup a server for another company owned by him. He has 2 latest MAC PRO and he can provide me any hardware I want. He listed the following requirements: Failover is a must Should be capable to handle 20 vpn connections at the same time RAID 5 Remote Copy of backup data to different loaction I know this is a generic question that I shuoldn't ask here, but I really need help because comparing to Linux and MS server. There are not many resources available online. I read the APPLE PRO TRAINING book but it tells nothing about the above requirements.