I have an existing Active Directory, which consist of two DCs, with three branch offices with one DC each and a fourth, smaller office with Read-Only DC. How would I go about a really good back up strategy I have few options I wanna try but need some advice on them.
1. Fault-tolerant hardware (Raid1, Raid5, etc)
2. Backup of the DC to local disk?
3. Backup of the DC to removable storage?
4. Additional DCs?