`replaceContents` creates a backup file, which is great. However if we run it on `/etc/apache2/conf-enabled/roundcube.conf` the backup file will be in `/etc/apache2/conf-enabled` while `/etc/apache2/conf-enabled/roundcube.conf` is a symlink of `/etc/apache2/conf-available/roundcube.conf` which is a symlink of `/etc/roundcube/apache.conf` and thus the backup should be in `/etc/roundcube` imho. At least I would look there for it... Besides I think we should add `DirectoryIndex index.php` so that the Alias works on all domains independent of the `DirectoryIndex` used for that website. The merge request modifies the filename used by `replaceContents` and adds `DirectoryIndex index.php`...