Improve printing

backup.sh

@@ -33,10 +33,10 @@ if [ -n "$BACKUP_HELPER_COMMANDS" ]; then
       IFS=' ' read -r -a cmd_parts <<< "$value"
       if ! output=$(restic backup --stdin-filename "$key" --stdin-from-command -- "${cmd_parts[@]}"); then
         exit_code=1;
-        echo "Backup of $i failed with exit code $?:"
+        echo "Backup of $key failed with exit code $?:"
         echo "$output"
       else
-        echo "Backup of $i successful:"
+        echo "Backup of $key successful:"
         echo "$output"
       fi