diff --git a/CHANGELOG.md b/CHANGELOG.md
index 330fa4b3..a0592f66 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## 3.3.3.dev
 * Add: display mtime_ns precision of storage folder with condition warning if too less
 * Improve: disable fsync during storage verification
+* Improve: suppress duplicate log lines on startup
 
 ## 3.3.2
 * Fix: debug logging in rights/from_file
diff --git a/radicale/log.py b/radicale/log.py
index 313b4933..ef2eb703 100644
--- a/radicale/log.py
+++ b/radicale/log.py
@@ -221,18 +221,31 @@ def setup() -> None:
         logger.error("Invalid RADICALE_LOG_FORMAT: %r", format_name)
 
 
+logger_display_backtrace_disabled: bool = False
+logger_display_backtrace_enabled: bool = False
+
+
 def set_level(level: Union[int, str], backtrace_on_debug: bool) -> None:
     """Set logging level for global logger."""
+    global logger_display_backtrace_disabled
+    global logger_display_backtrace_enabled
     if isinstance(level, str):
         level = getattr(logging, level.upper())
         assert isinstance(level, int)
     logger.setLevel(level)
     if level > logging.DEBUG:
-        logger.info("Logging of backtrace is disabled in this loglevel")
+        if logger_display_backtrace_disabled is False:
+            logger.info("Logging of backtrace is disabled in this loglevel")
+            logger_display_backtrace_disabled = True
         logger.addFilter(REMOVE_TRACEBACK_FILTER)
     else:
         if not backtrace_on_debug:
-            logger.debug("Logging of backtrace is disabled by option in this loglevel")
+            if logger_display_backtrace_disabled is False:
+                logger.debug("Logging of backtrace is disabled by option in this loglevel")
+                logger_display_backtrace_disabled = True
             logger.addFilter(REMOVE_TRACEBACK_FILTER)
         else:
+            if logger_display_backtrace_enabled is False:
+                logger.debug("Logging of backtrace is enabled by option in this loglevel")
+                logger_display_backtrace_enabled = True
             logger.removeFilter(REMOVE_TRACEBACK_FILTER)