feat: add server-side backup scripts and restore guide

scripts/backup-dokumen-kesiswaan.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+APP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+BACKUP_ROOT="${BACKUP_ROOT:-/var/backups/database-kesiswaan}"
+TIMESTAMP="${TIMESTAMP:-$(date '+%Y-%m-%d-%H%M%S')}"
+RETENTION_DAYS="${RETENTION_DAYS:-14}"
+SOURCE_DIR="${SOURCE_DIR:-$APP_DIR/storage/app/public}"
+
+abort() {
+  printf '[ERROR] %s\n' "$1" >&2
+  exit 1
+}
+
+log() {
+  printf '[%s] %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$1"
+}
+
+require_bin() {
+  command -v "$1" >/dev/null 2>&1 || abort "Binary '$1' tidak ditemukan."
+}
+
+[[ -d "$SOURCE_DIR" ]] || abort "Folder sumber dokumen tidak ditemukan di $SOURCE_DIR"
+require_bin tar
+
+TARGET_DIR="$BACKUP_ROOT/files"
+mkdir -p "$TARGET_DIR"
+TARGET_FILE="$TARGET_DIR/storage-public-${TIMESTAMP}.tar.gz"
+
+log "Memulai backup dokumen dari '$SOURCE_DIR'"
+tar -czf "$TARGET_FILE" -C "$SOURCE_DIR" .
+
+find "$TARGET_DIR" -type f -name '*.tar.gz' -mtime +"$RETENTION_DAYS" -delete || true
+
+log "Backup dokumen selesai: $TARGET_FILE"
+printf '%s\n' "$TARGET_FILE"