i want migrate my Wordpress Multisite Installation whit

Hi,
i want migrate my Wordpress Multisite Installation
whit Multidomain, Domainmapping and whit 2 subsites to a Local-Test-Enviroment.
What are the best practise to achieve my goal?
What i have to change in the wp-config.php and in my database-file?
Are there some changings in the sunrise.php?

Thanks for your help!