Backing Up the DHCP Database

The Backup directory in the %SystemRoot%\System32\DHCP folder contains backup information for the DHCP configuration and the DHCP database. By default, the DHCP database is backed up every 60 minutes automatically. To manually back up the DHCP database at any time, follow these steps:
1. In the DHCP console, right-click the server you want to back up, and then click Backup.
2. In the Browse For Folder dialog box, select the folder that will contain the backup DHCP database, and then click OK.

Registry keys that control the location and timing of DHCP backups, as well as other DHCP settings, are located under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DHCPServer\Parameters.

The following keys control the DHCP database and backup configuration:

• BackupDatabasePath Sets the location of the DHCP database. You should set this option through the DHCP Properties dialog box. Click the Advanced tab, and then set the Database Path field as appropriate.
• DatabaseName Sets the name of the primary DHCP database file. The default value is DHCP.mdb.
• BackupInterval Determines how often the DHCP client information database is backed up. The default is 60 minutes.
• DatabaseCleanupInterval Determines how often the DHCP service deletes expired records from the DHCP client information database. The default is four hours.

Cr. https://technet.microsoft.com/