Windows 2008 Best Raid Configuration

view story

http://serverfault.com – I have 4 2TB hard drives and I was thinking about using Raid 10. This would give me 4TB correct? My next question is would it be easy to add more hard drives to the raid array. For example if I bought another hard drive can I add it to the array without backing up any data? Basically I want to be able to start off with 4TB and when the space becomes full add more space as needed. If this isn't possible with Raid 10, is it possible with any Raid configuration. Any suggestions would be appreciated. Thank you. (HowTos)