Did you test restoring to different hardware without IDR?
I have been reviewing my disaster recovery plan since upgrading to 11D. With past BE versions, I created ISO files for each server and stored the images on an offsite server that had a CD burner.
With 11D, I was really hoping to get away from having to keep up with those files. From what I have read, it appears that if you are restoring to the same hardware, you do not need the ISO CD. However, if you have to restore to disimilar hardware (which would probably be the case in a true disaster), you still have to have the whole IDR structure in place (ISO CD & .DR file).
I have 2 servers (one older and one brand new) that I plan to test on next week just to see if I can restore to different hardware without the IDR option.
I will post back after that.