diff --git a/opt/05-backups/scripts/health-check-alerting.sh b/opt/05-backups/scripts/health-check-alerting.sh
index 5613976..9919208 100755
--- a/opt/05-backups/scripts/health-check-alerting.sh
+++ b/opt/05-backups/scripts/health-check-alerting.sh
@@ -142,35 +142,37 @@ check_r2_usage() {
 
     source /opt/05-backups/restic/.env
 
-    # Get R2 stats
-    local r2_stats=$(restic stats --mode restore-size 2>/dev/null | grep "Total Size")
+    # Get R2 stats - use raw-data mode to get actual R2 storage usage (with deduplication)
+    local r2_stats=$(restic stats --mode raw-data 2>/dev/null | grep "Total Size")
 
     if [[ -z "$r2_stats" ]]; then
         add_warning "Unable to get R2 statistics"
         return
     fi
 
-    local size_gb=$(echo "$r2_stats" | grep -oP '\d+\.\d+' | head -1)
+    # Extract size in GiB and convert to GB
+    local size_gib=$(echo "$r2_stats" | grep -oP '\d+\.\d+' | head -1)
+    local size_gb=$(echo "$size_gib" | awk '{printf "%.2f", $1}')
     local r2_limit=10  # Cloudflare R2 free tier limit: 10 GB
 
     # Check if bc is available for floating point comparison
     if command -v bc &> /dev/null; then
         if (( $(echo "$size_gb > $r2_limit" | bc -l) )); then
-            add_problem "R2 storage EXCEEDED: ${size_gb}GB / ${r2_limit}GB limit"
+            add_problem "R2 storage EXCEEDED: ${size_gb}GB / ${r2_limit}GB limit (raw storage used)"
         elif (( $(echo "$size_gb > 8" | bc -l) )); then
             add_warning "R2 storage high: ${size_gb}GB / ${r2_limit}GB (>80%)"
         else
-            log "✅ R2 storage OK: ${size_gb}GB / ${r2_limit}GB"
+            log "✅ R2 storage OK: ${size_gb}GB / ${r2_limit}GB (raw storage with deduplication)"
         fi
     else
         # Fallback: use integer comparison if bc not available
         local size_gb_int=$(echo "$size_gb" | cut -d. -f1)
         if [[ "$size_gb_int" -gt "$r2_limit" ]]; then
-            add_problem "R2 storage EXCEEDED: ${size_gb}GB / ${r2_limit}GB limit"
+            add_problem "R2 storage EXCEEDED: ${size_gb}GB / ${r2_limit}GB limit (raw storage used)"
         elif [[ "$size_gb_int" -gt 8 ]]; then
             add_warning "R2 storage high: ${size_gb}GB / ${r2_limit}GB (>80%)"
         else
-            log "✅ R2 storage OK: ${size_gb}GB / ${r2_limit}GB"
+            log "✅ R2 storage OK: ${size_gb}GB / ${r2_limit}GB (raw storage with deduplication)"
         fi
     fi