diff --git a/util/MsSql/backup-db.sh b/util/MsSql/backup-db.sh
index d7234d66b..e5b4f8f84 100644
--- a/util/MsSql/backup-db.sh
+++ b/util/MsSql/backup-db.sh
@@ -1,9 +1,14 @@
 #!/bin/sh
+BACKUP_INTERVAL=${BACKUP_INTERVAL:-next day}
+BACKUP_INTERVAL_FORMAT=${BACKUP_INTERVAL_FORMAT:-%Y-%m-%d 00:00:00}
 
 while true
 do
   # Sleep until next day
-  [ "$1" = "loop" ] && sleep $((24 * 3600 - (`date +%_H` * 3600 + `date +%_M` * 60 + `date +%_S`)))
+  if [ "$1" = "loop" ]; then
+    interval_start=`date "+${BACKUP_INTERVAL_FORMAT} %z" -d "${BACKUP_INTERVAL}"`
+    sleep $((`date +%_s -d "${interval_start}"` - `date +%_s`))
+  fi
 
   # Backup timestamp
   export now=$(date +%Y%m%d_%H%M%S)