No server coordination
- each subnet can only have one scope (continuous, but you can exclude some IP addresses), but
- you can create DHCP servers with non-overlapping scopes to the same subnet (not MS party line)
Backup and fault tolerance
- DHCP makes an hourly backup of its database
- it can recover itself, but you should do a backup of its backup if you think something is wrong
- copy the DHCP backup before stopping it (at shutdown does another backup).