Microsoft recommends routine maintenance of the DHCP server component when its database exceeds 30 MB. While this is normally done automatically, you may have to manually repair the database if it gets too large between compactions.
Here's how to compact the DHCP database:
This will compress the DHCP database into the Compress.mdb file, copy the Compress.mdb file back over Dhcp.mdb, and then delete Compress.mdb.
Backups of the DHCP server are also automated (generally every hour), but you can configure the system to back up more frequently. Follow these steps to change the DHCP backup interval:
Note: Editing the registry is risky, so be sure you have a verified backup before saving any changes.