.rpmnew

Sorry for the maybe ignorant question:

After updates .php.rpmnew config files are generated in /etc/roundcube.
These do not contain the customizations (passwords, addresses etc) of
the original config files.

How do you deal with those files?
Do you transfer all the customizations step by step via editor or do you
somehow run setup-kolab rouncdube again?

Thanks for pointing me in the right direction here,
JP