Additonal DC install - Backup solution
My current DC is on Windows 2003. Been preparing for the install of an additional 2008R2 DC over Easter, to allow me to make use of the newer features within the OS. Will be keeping the 2003DC for the time being, and running both DCs alongside one another.
Having checked out various backup solutions for the new DC (the 2003 box is backed up via Acronis) I came across an article which suggested having a backup solution for a secondary DC is pointless as you cannot restore a DC back into a domain with another DC operating, as the timestamps in the restored AD will cause serious issues. The suggestion being that if you lose one of the DCs, you would simply (or not simply) grab all the roles to the working DC, rebuild the downed DC, then re-add the rebuilt DC back into the domain.
Does this sound like a credible solution to DC backups, or are their industry standard backup solutions that cater for backing up (and restoring) DCs (when you have more than one in your domain)?