In support to Mark's comments, include DHCP backup in your daily backup schedule. This way you have the backup of DHCP data. In case of any DHCP server failure, you can restore your DHCP to some other server or to the same server. Following are the links which has information on this:
The traditional way of having DHCP redundancy is the 80/20 rule, IE one server has 80% of the addresses available to lease and another has 20%.
Have a look at this article which is about DHCP redundancy but makes a case for a 50/50 split;
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