Plain text is also easier to search. If you can't remember which configuration file manages your system backups, a quick grep -r backup /etc should tell you.
For instance, suppose you have a production deployment of a large application with a complex site-specific configuration file. If this file is in plain text, you could place it under a version control system (see Topic 19, ), so that you automatically keep a history of all changes. File comparison tools such as diff and fc allow you to see at a glance what changes have been made, while sum allows you to generate a checksum to monitor the file for accidental (or malicious) modification.