[Data sources](../../models/core/datasource.md) can be defined to reference data which exists on systems of record outside NetBox, such as a git repository or Amazon S3 bucket. Plugins can register their own backend classes to introduce support for additional resource types. This is done by subclassing NetBox's `DataBackend` class.
```python title="data_backends.py"
from netbox.data_backends import DataBackend
class MyDataBackend(DataBackend):
name = 'mybackend'
label = 'My Backend'
...
```
To register one or more data backends with NetBox, define a list named `backends` at the end of this file:
```python title="data_backends.py"
backends = [MyDataBackend]
```
!!! tip
The path to the list of search indexes can be modified by setting `data_backends` in the PluginConfig instance.
