Problems.

Yes, I’m sure about my servers. Server1 is DNS Server has AD Integrated. All the rights I have like: Global catalog, schema master… Server2 is DC but use the same DNS with Server1. I’ve not reinstalled yet. I really want to know what happens if I reinstall Server1. Do I need to backup Server1? What’s the way I must do to ensure my systems still good? Please let me know if you can. Thank a lot!