Querying a Storage Backend

Run the following command to obtain the help information about querying a backend.
```
oceanctl get backend -h
```
Run the following command to query a single storage backend in the default namespace.
```
oceanctl get backend <backend-name>
```
Run the following command to query all storage backends in the specified namespace.
```
oceanctl get backend -n <namespace>
```
Run the following command to format the output. Currently, json, yaml, and wide are supported.
```
oceanctl get backend <backend-name> -o json
```