How to update configs in /usr/local/etc after persisting?

[eno]

Since the extensions are mounted read-only, what's the normal way to update anything in /usr/local/etc ?

[Rich]

Hi eno
Replace the link in  /usr/local/etc  with a copy of the file it is pointing to. Edit the file with your changes and add it to your backup.

[bmarkus]

Packages with config files expected to be modified by user have a startup script which checks exestence of the config file. If doesn't exist they are creating it or copying a default version. If exists this is skipped. Makes a life easier. Study scripts in /usr/local/tce.installed how is it done.