Only frontpage is in cache

Have you changed the .htaccess according to the wiki?
https://github.com/pluginkollektiv/cachify/wiki/Caching-Methoden#festplatte-hdd-cache (German)

If yes, what’s your hoster? Maybe domainfactory or 1and1, then please see the additional notes in the wiki.

All the best,
Torsten

In the case of the following:

<Files index.php>
    php_value auto_prepend_file /pfad/plugins/cachify/apc/proxy.php
</Files>

What does /pfad/ mean?

Sorry for the late reply!

It means “path” – Pfad is the German translation for path.

All the best,
Torsten