diff --git a/perun/configuration.py b/perun/configuration.py
index 830d340..f9dd44e 100644
--- a/perun/configuration.py
+++ b/perun/configuration.py
@@ -27,8 +27,8 @@
     "benchmarking": {
         "rounds": 1,
         "warmup_rounds": 0,
-        "units": {"JOULE": "k", "SECOND": "", "PERCENT": "", "POWER": ""},
     },
+    "benchmarking.units": {"joule": "k", "second": "", "percent": "", "power": ""},
     "debug": {"log_lvl": "WARNING"},
     # "horeka": {"enabled": False, "url": "", "token": "", "org": ""},
 }
diff --git a/perun/io/bench.py b/perun/io/bench.py
index 8e6f07f..806f07a 100644
--- a/perun/io/bench.py
+++ b/perun/io/bench.py
@@ -33,10 +33,10 @@ def exportBench(dataNode: DataNode, mr_id: str) -> str:
     mrNode = dataNode.nodes[mr_id]
 
     bench_units: Dict[str, Magnitude] = {
-        "JOULE": Magnitude.fromSymbol(mrNode.metadata["benchmarking.units.JOULE"]),
-        "SECOND": Magnitude.fromSymbol(mrNode.metadata["benchmarking.units.SECOND"]),
-        "WATT": Magnitude.fromSymbol(mrNode.metadata["benchmarking.units.WATT"]),
-        "PERCENT": Magnitude.fromSymbol(mrNode.metadata["benchmarking.units.PERCENT"]),
+        "JOULE": Magnitude.fromSymbol(mrNode.metadata["benchmarking.units.joule"]),
+        "SECOND": Magnitude.fromSymbol(mrNode.metadata["benchmarking.units.second"]),
+        "WATT": Magnitude.fromSymbol(mrNode.metadata["benchmarking.units.power"]),
+        "PERCENT": Magnitude.fromSymbol(mrNode.metadata["benchmarking.units.percent"]),
     }
 
     for metricType, metric in mrNode.metrics.items():
diff --git a/perun/perun.py b/perun/perun.py
index 207d684..f58bf64 100644
--- a/perun/perun.py
+++ b/perun/perun.py
@@ -90,21 +90,21 @@ def backends(self) -> Dict[str, Backend]:
         """
         if not self._backends:
             self._backends = {}
-            classList: List[Type[Backend]] = [
-                IntelRAPLBackend,
-                NVMLBackend,
-                PSUTILBackend,
-            ]
-            for backend in classList:
+            classList: Dict[str, Type[Backend]] = {
+                "IntelRAPL": IntelRAPLBackend,
+                "NVML": NVMLBackend,
+                "PSUTIL": PSUTILBackend,
+            }
+            for name, backend in classList.items():
                 try:
                     backend_instance = backend()
                     self._backends[backend_instance.id] = backend_instance
                 except ImportError as ie:
-                    log.info(f"Missing dependencies for backend {backend.name}")
+                    log.info(f"Missing dependencies for backend {name}")
                     log.info(ie)
                 except Exception as e:
-                    log.warning(f"Unknown error loading dependecy {backend.name}")
-                    log.warning(e)
+                    log.info(f"Unknown error loading dependecy {name}")
+                    log.info(e)
 
         return self._backends