diff --git a/lib/clean/system.sh b/lib/clean/system.sh
index b23081b..9a8d664 100644
--- a/lib/clean/system.sh
+++ b/lib/clean/system.sh
@@ -215,6 +215,11 @@ clean_time_machine_failed_backups() {
         echo -e "  ${GREEN}${ICON_SUCCESS}${NC} No incomplete backups found"
         return 0
     fi
+    # Fast pre-check: skip entirely if Time Machine is not configured (no tmutil needed)
+    if ! defaults read /Library/Preferences/com.apple.TimeMachine AutoBackup 2> /dev/null | grep -qE '^[01]$'; then
+        echo -e "  ${GREEN}${ICON_SUCCESS}${NC} No incomplete backups found"
+        return 0
+    fi
     start_section_spinner "Checking Time Machine configuration..."
     local spinner_active=true
     local tm_info
@@ -396,6 +401,10 @@ clean_local_snapshots() {
     if ! command -v tmutil > /dev/null 2>&1; then
         return 0
     fi
+    # Fast pre-check: skip entirely if Time Machine is not configured (no tmutil needed)
+    if ! defaults read /Library/Preferences/com.apple.TimeMachine AutoBackup 2> /dev/null | grep -qE '^[01]$'; then
+        return 0
+    fi
 
     start_section_spinner "Checking Time Machine status..."
     local rc_running=0
diff --git a/lib/clean/user.sh b/lib/clean/user.sh
index ef441a5..ae48055 100644
--- a/lib/clean/user.sh
+++ b/lib/clean/user.sh
@@ -421,10 +421,7 @@ clean_support_app_data() {
     fi
 
     # Clean old aerial wallpaper videos (can be large, safe to remove).
-    local wallpaper_videos_dir="$HOME/Library/Application Support/com.apple.wallpaper/aerials/videos"
-    if [[ -d "$wallpaper_videos_dir" && ! -L "$wallpaper_videos_dir" ]]; then
-        safe_find_delete "$wallpaper_videos_dir" "*" "$support_age_days" "f" || true
-    fi
+    safe_clean ~/Library/Application\ Support/com.apple.wallpaper/aerials/videos/* "Aerial wallpaper videos"
 
     # Do not touch Messages attachments, only preview/sticker caches.
     if pgrep -x "Messages" > /dev/null 2>&1; then
@@ -1034,7 +1031,8 @@ check_large_file_candidates() {
         fi
     fi
 
-    if [[ "${SYSTEM_CLEAN:-false}" != "true" ]] && command -v tmutil > /dev/null 2>&1; then
+    if [[ "${SYSTEM_CLEAN:-false}" != "true" ]] && command -v tmutil > /dev/null 2>&1 \
+        && defaults read /Library/Preferences/com.apple.TimeMachine AutoBackup 2> /dev/null | grep -qE '^[01]$'; then
         local snapshot_list snapshot_count
         snapshot_list=$(run_with_timeout 3 tmutil listlocalsnapshots / 2> /dev/null || true)
         if [[ -n "$snapshot_list" ]]; then