diff --git a/backups/backup.py b/backups/backup.py
index 9b4626fe..9ccd7d22 100644
--- a/backups/backup.py
+++ b/backups/backup.py
@@ -74,15 +74,17 @@ def run_importer_script() -> None:
             http_port,
         ]
 
+    stderr = None
     stdout = ""
-    try:
-        popen = subprocess.Popen(
-            command, cwd="/opt/capella", stdout=subprocess.PIPE, text=True
-        )
+    with subprocess.Popen(
+        command, cwd="/opt/capella", stdout=subprocess.PIPE, text=True
+    ) as popen:
         assert popen.stdout
         for line in popen.stdout:
             stdout += line
-            print(line, end="")
+
+            # Flush is needed, otherwise the logs are delayed
+            print(line, end="", flush=True)
 
             # Failed imports still have exit code 0.
             # In addition, the process hangs up when these log lines appear sometimes.
@@ -103,22 +105,32 @@ def run_importer_script() -> None:
                 raise RuntimeError(
                     f"{ERROR_PREFIX} - Failed to copy to output folder ({OUTPUT_FOLDER})"
                 )
-    finally:
-        if popen:
-            popen.terminate()
 
-    if (return_code := popen.returncode) != 0:
-        raise subprocess.CalledProcessError(return_code, command)
+        if popen.stderr:
+            stderr = ""
+            stderr += popen.stderr.read()
 
-    if not re.search(r"[1-9][0-9]* projects imports succeeded", stdout):
-        raise RuntimeError(
-            f"{ERROR_PREFIX} - '[1-9][0-9]* projects imports succeeded' not found in logs"
-        )
-    if not re.search(r"[1-9][0-9]* copies succeeded", stdout):
+    if (return_code := popen.returncode) != 0:
+        log.exception("Command failed with stderr: '%s'", stderr)
         raise RuntimeError(
-            f"{ERROR_PREFIX} - '[1-9][0-9]* copies succeeded' not found in logs"
+            f"Capella importer failed with exit code {return_code}"
         )
 
+    if is_capella_5_0_x():
+        if not re.search(r"!MESSAGE [1-9][0-9]* Succeeded", stdout):
+            raise RuntimeError(
+                f"{ERROR_PREFIX} - '!MESSAGE [1-9][0-9]* Succeeded' not found in logs"
+            )
+    else:
+        if not re.search(r"[1-9][0-9]* projects imports succeeded", stdout):
+            raise RuntimeError(
+                f"{ERROR_PREFIX} - '[1-9][0-9]* projects imports succeeded' not found in logs"
+            )
+        if not re.search(r"[1-9][0-9]* copies succeeded", stdout):
+            raise RuntimeError(
+                f"{ERROR_PREFIX} - '[1-9][0-9]* copies succeeded' not found in logs"
+            )
+
     log.info("Import of model from TeamForCapella server finished")
 
 
@@ -289,6 +301,10 @@ def is_capella_5_x_x() -> bool:
     return bool(re.match(r"5.[0-9]+.[0-9]+", os.getenv("CAPELLA_VERSION", "")))
 
 
+def is_capella_5_0_x() -> bool:
+    return bool(re.match(r"5.0.[0-9]+", os.getenv("CAPELLA_VERSION", "")))
+
+
 def get_http_envs() -> tuple[str, str, str]:
     http_login = os.getenv("HTTP_LOGIN")
     http_password = os.getenv("HTTP_PASSWORD")