diff --git a/.gitignore b/.gitignore
index 207f22f..e2f6593 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,6 @@
 simulated-test-with-php-data-collection/rtc-test-cookies.txt
 simulated-test-with-php-data-collection/rtc-test.env
 /rtc-test-cookies.txt
+
+test-results-[0-9]*.log
+submit-response-[0-9]*.log
diff --git a/rtc-test.php b/rtc-test.php
index d3822d8..0adef9c 100644
--- a/rtc-test.php
+++ b/rtc-test.php
@@ -503,14 +503,19 @@ function rtctest_register_routes() {
 			'callback'            => 'rtctest_rest_report_all',
 			'permission_callback' => $cap_check,
 			'args'                => array(
-				'poll_delay'  => array(
+				'poll_delay'   => array(
 					'required' => false,
 					'type'     => 'integer',
 				),
-				'update_size' => array(
+				'update_size'  => array(
 					'required' => false,
 					'type'     => 'string',
 				),
+				'save_results' => array(
+					'required' => false,
+					'type'     => 'boolean',
+					'default'  => false,
+				),
 			),
 		)
 	);
@@ -875,7 +880,15 @@ function rtctest_rest_report_all( WP_REST_Request $request ) {
 		}
 	}
 
-	return rest_ensure_response( array( 'text' => ltrim( $out ) ) );
+	$report_text = ltrim( $out );
+
+	if ( $request->get_param( 'save_results' ) ) {
+		$timestamp = gmdate( 'Ymd\THis\Z' );
+		$path      = ABSPATH . 'test-results-' . $timestamp . '.log';
+		file_put_contents( $path, $report_text, LOCK_EX );
+	}
+
+	return rest_ensure_response( array( 'text' => $report_text ) );
 }
 
 function rtctest_detect_object_cache_type() {
@@ -1071,6 +1084,10 @@ function rtctest_rest_submit( WP_REST_Request $request ) {
 		)
 	);
 
+	$submission_time = gmdate( 'Ymd\THis\Z' );
+	$log_path        = ABSPATH . 'submit-response-' . $submission_time . '.log';
+	file_put_contents( $log_path, print_r( $response, true ), LOCK_EX );
+
 	if ( is_wp_error( $response ) ) {
 		return new WP_Error( 'submit_failed', $response->get_error_message(), array( 'status' => 502 ) );
 	}
diff --git a/rtc-test.sh b/rtc-test.sh
index 65d291c..ee822d6 100755
--- a/rtc-test.sh
+++ b/rtc-test.sh
@@ -1732,8 +1732,20 @@ cmd_report() {
 cmd_report_all() {
 	print_header "report-all"
 	require_auth
+	local url="${PLUGIN_REPORT_ALL_URL}"
+	local arg
+	for arg in "$@"; do
+		case "${arg}" in
+			--save-results)
+				case "${url}" in
+					*\?*) url="${url}&save_results=1" ;;
+					*)    url="${url}?save_results=1" ;;
+				esac
+				;;
+		esac
+	done
 	local data
-	data=$(curl "${BASE_CURL_OPTS[@]}" "${PLUGIN_REPORT_ALL_URL}" 2>/dev/null) || true
+	data=$(curl "${BASE_CURL_OPTS[@]}" "${url}" 2>/dev/null) || true
 	_print_report_text "${data}"
 }
 
@@ -2080,7 +2092,7 @@ case "${COMMAND}" in
 	sustain)                cmd_sustain ;;
 	env)                    cmd_env ;;
 	report)                 cmd_report ;;
-	report-all)             cmd_report_all ;;
+	report-all)             shift; cmd_report_all "$@" ;;
 	submit-results)         cmd_submit_results ;;
 	clear)                  cmd_clear ;;
 	reset)                  cmd_reset ;;
@@ -2113,7 +2125,7 @@ case "${COMMAND}" in
 		printf '  sustain               N_CLIENTS independent pollers for DURATION seconds\n'
 		printf '  env                   Print environment snapshot (PHP, WP, DB, cache, etc.)\n'
 		printf '  report                Fetch log from plugin and print summary table\n'
-		printf '  report-all            Print summary by approach × scenario × poll_delay × update_size\n'
+		printf '  report-all [--save-results]  Print summary by approach × scenario × poll_delay × update_size (--save-results writes test-results-TIMESTAMP.log to ABSPATH)\n'
 		printf '  submit-results        POST all results to the reporter endpoint (requires REPORTER_* vars)\n'
 		printf '  clear                 Delete all log entries (table stays, schema intact)\n'
 		printf '  reset                 Drop the log table entirely (recreated on next tagged request)\n'
diff --git a/run.sh b/run.sh
index b22366f..89b8583 100755
--- a/run.sh
+++ b/run.sh
@@ -153,7 +153,7 @@ done
 bash "${RTC}" reset-approach
 
 # ── Results ───────────────────────────────────────────────────────────────────
-bash "${RTC}" report-all
+bash "${RTC}" report-all --save-results
 bash "${RTC}" submit-results
 
 printf '\nTotal wall time: %s\n' "$(_run_sh_format_elapsed "${SECONDS}")"