Make sure everyone logs out of Control and the SSLIP is shut down on both servers, and stop all associated services on the old server (Chapi, CDAS, Homegate, ect.)
On the old server, launch SQL Server Management Studio.
Log into the local SQL instance that hosts your Control database (it is usually called Cyrious). You should be able to log in using Windows Authentication.
Expand the Databases folder.
Right-click on the Control database (usually called StoreData) and choose Tasks > Back Up…
In the backup window, remove any existing files listed in the destination box, then add a destination path and file for your backup. It's best to use the .bak extension for the backup.