diff --git a/borg_exporter.sh b/borg_exporter.sh
index 3910269..c1b9ccb 100755
--- a/borg_exporter.sh
+++ b/borg_exporter.sh
@@ -9,10 +9,14 @@ TEXTFILE_COLLECTOR_DIR=${TEXTFILE_COLLECTOR_DIR:-/var/lib/node_exporter/}
 PROM_FILE=$TEXTFILE_COLLECTOR_DIR/backup.prom
 TMP_FILE=$PROM_FILE.$$
 
-mapfile -t REPOS < <(find $REPO_BASE -type d -name data -print0 | xargs --null -n1 dirname)
+mapfile -t REPOS < <(find "$REPO_BASE" -type d -name data -print0 | xargs --null -n1 dirname)
+
+if [[ -n "${REPOS[*]}" ]] ; then
+  echo "# TYPE backup_age_seconds gauge"
+  echo "# TYPE backup_total_size_bytes gauge"
+fi >> "$TMP_FILE"
 
 for repository in "${REPOS[@]}" ; do
-  echo "# $repository"
   hostname=${HOSTNAMES[$repository]:-$repository}
   if [[ "$hostname" == "$repository" ]] ; then
     hostname=${hostname/"${REPO_BASE}/"//}
@@ -20,9 +24,9 @@ for repository in "${REPOS[@]}" ; do
   fi
   index_base="$repository/index"
   age_seconds="$(( $(date +%s) - $(date +%s -r "$index_base".*) ))"
-  size="$(du -s "$repository" | cut -d/  -f1)"
-  echo backup_age_time_seconds\{host=\""$hostname"\", repository=\""$repository"\"\} "$age_seconds"
-  echo backup_size_bytes\{host=\""$hostname"\", repository=\""$repository"\"\} "$size"
-done >> $TMP_FILE
+  size="$(du -s "$repository" | cut -f1)"
+  echo backup_age_seconds\{host=\""$hostname"\",repository=\""$repository"\"\} "$age_seconds"
+  echo backup_total_size_bytes\{host=\""$hostname"\",repository=\""$repository"\"\} "$size"
+done >> "$TMP_FILE"
 
-mv $TMP_FILE $PROM_FILE
+mv "$TMP_FILE" "$PROM_FILE"