backend: /etc/crowdsec/plugins/backend # path to the backend plugin used
```
For {{cli.name}} to be able to pull the {{api.topX.htmlname}}, you need a valid API configuration in [api.yaml](/guide/crowdsec/overview/#apiyaml).
## Hub cache
-`.index.json`: The file containing the metadata of all the existing {{collections.htmlname}}, {{parsers.htmlname}} and {{scenarios.htmlname}} stored in the {{hub.htmlname}}.
-`hub/*`: Folder containing all the {{collections.htmlname}}, {{parsers.htmlname}} and {{scenarios.htmlname}} stored in the {{hub.htmlname}}.
This is used to manage configurations from the {{cli.name}}