diff --git a/pybackup.py b/pybackup.py
index 23661df..f8d73df 100644
--- a/pybackup.py
+++ b/pybackup.py
@@ -3,27 +3,57 @@
 import sys
 import json
 
-#CONFIGURATION_PATH = "/etc/pybackup.conf"  # for "production"
+# CONFIGURATION_PATH = "/etc/pybackup.conf"  # for "production"
 CONFIGURATION_PATH = "pybackup.conf"  # for testing
 
+
 def log(message: str, log_level: int) -> bool:
     assignments = {0: "DEBUG", 1: "VERBOSE", 2: "INFO", 3: "ERROR", 4: "FATAL"}
-    if(log_level not in assignments):
+    if log_level not in assignments:
         return False  # show that something went wrong
-    print(f"[{assignments[log_level]}] {message}")
+    print('\033[91m', end="") if log_level >= 3 else print("", end="")  # ink the output red if error/fatal is logged
+    print(f"[{assignments[log_level]}] {message}\033[0m")
+    if log_level == 4:
+        print("Exiting...")
+        exit(1)
     return True
 
-if not __name__ == "__main__":  # just to make sure this program isn't used as a module
+
+# just to make sure this program isn't used as a module
+if not __name__ == "__main__":
     print(f"[{sys.argv[0]}]: THIS BACKUP PROGRAM IS NOT A PYTHON MODULE!")
     exit(0)
 
+
 conf_f = open(CONFIGURATION_PATH, "r")
-try:
+try:  # load the config if possible
     conf = json.load(conf_f)
 except json.decoder.JSONDecodeError:
-    log("The configuration file is corrupted", 3)
-    exit(1)
+    log("The configuration file is corrupted.", 4)
 conf_f.close()
 
+# test if the locations key exists in the config file
+try:
+    conf["locations"]
+except KeyError:
+    log("The configuration file has no locations inside. Maybe the root 'locations' key is wrongly spelled?", 4)
 
-print(conf)
+# test for each location if the data was correctly written into the config
+counter = 0
+for _location in conf["locations"]:
+    try:
+        _location["name"]
+    except KeyError:
+        log(f"The {counter+1}th element of locations in the config has no name. Skipping this backup path...", 3)
+        conf["locations"].pop(counter)
+
+    try:
+        _location["path"]
+        _location["backup_path"]
+        _location["frequency"]
+        _location["versions"]
+    except KeyError:
+        log(f"The {counter + 1}th element with the name \"{_location['name']}\" of locations in the config is corrupted. Skipping this backup path...", 3)
+        conf["locations"].pop(counter)
+
+    counter += 1