diff --git a/scripts/backup.sh b/scripts/backup.sh
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+++ b/scripts/backup.sh
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+#!/usr/bin/env bash
+# =====================================================================
+# WebGIS Database Backup Script
+# Location: /opt/webgis-lohne/scripts/backup.sh (on server)
+# Purpose:  Creates compressed pg_dump backups with daily/weekly/monthly
+#           rotation. Intended to be run via cron.
+# =====================================================================
+
+set -euo pipefail
+
+# ---------------------------------------------------------------------
+# Configuration
+# ---------------------------------------------------------------------
+DB_HOST="localhost"
+DB_PORT="5432"
+DB_NAME="webgis-db"
+DB_USER="webgis-db-admin"
+
+BACKUP_ROOT="/var/backups/webgis"
+BACKUP_DIR_DAILY="${BACKUP_ROOT}/daily"
+BACKUP_DIR_WEEKLY="${BACKUP_ROOT}/weekly"
+BACKUP_DIR_MONTHLY="${BACKUP_ROOT}/monthly"
+
+# Retention Periods (in days)
+KEEP_DAILY=7
+KEEP_WEEKLY=28
+KEEP_MONTHLY=365
+
+# Password is read from a protected file (see setup instructions).
+# pg_dump honors the PGPASSFILE environment variable.
+export PGPASSFILE="/root/.pgpass_webgis"
+
+
+# ---------------------------------------------------------------------
+# Preparation
+# ---------------------------------------------------------------------
+TIMESTAMP=$(date +"%Y-%m-%d_%H-%M-%S")
+DAY_OF_WEEK=$(date +"%u")      # 1=Monday ... 7=Sunday
+DAY_OF_MONTH=$(date +"%d")
+
+mkdir -p "${BACKUP_DIR_DAILY}" "${BACKUP_DIR_WEEKLY}" "${BACKUP_DIR_MONTHLY}"
+
+
+# ---------------------------------------------------------------------
+# Create Daily Backup (Custom-Format, compressed)
+# ---------------------------------------------------------------------
+DAILY_FILE="${BACKUP_DIR_DAILY}/webgis_${TIMESTAMP}.dump"
+
+echo "[$(date)] Starting daily backup -> ${DAILY_FILE}"
+
+pg_dump \
+    --host="${DB_HOST}" \
+    --port="${DB_PORT}" \
+    --username="${DB_USER}" \
+    --format=custom \
+    --compress=9 \
+    --file="${DAILY_FILE}" \
+    "${DB_NAME}"
+
+echo "[$(date)] Daily backup complete."
+
+
+# ---------------------------------------------------------------------
+# Promote to Weekly Backup on Sundays
+# ---------------------------------------------------------------------
+if [[ "${DAY_OF_WEEK}" == "7" ]]; then
+    cp "${DAILY_FILE}" "${BACKUP_DIR_WEEKLY}/webgis_${TIMESTAMP}.dump"
+    echo "[$(date)] Promoted to weekly backup."
+fi
+
+
+# ---------------------------------------------------------------------
+# Promote to Monthly Backup on the First of the Month
+# ---------------------------------------------------------------------
+if [[ "${DAY_OF_MONTH}" == "01" ]]; then
+    cp "${DAILY_FILE}" "${BACKUP_DIR_MONTHLY}/webgis_${TIMESTAMP}.dump"
+    echo "[$(date)] Promoted to monthly backup."
+fi
+
+
+# ---------------------------------------------------------------------
+# Rotation: Delete Backups Older than Retention Period
+# ---------------------------------------------------------------------
+find "${BACKUP_DIR_DAILY}"   -name "*.dump" -mtime +${KEEP_DAILY}   -delete
+find "${BACKUP_DIR_WEEKLY}"  -name "*.dump" -mtime +${KEEP_WEEKLY}  -delete
+find "${BACKUP_DIR_MONTHLY}" -name "*.dump" -mtime +${KEEP_MONTHLY} -delete
+
+
+echo "[$(date)] Backup rotation complete."
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