diff --git a/deploy/wizwar-backup.sh b/deploy/wizwar-backup.sh
new file mode 100755
index 0000000..9cf5caf
--- /dev/null
+++ b/deploy/wizwar-backup.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+# Nightly wiz-war ledger backup to DigitalOcean Spaces.
+#   current/    - exact mirror of /var/lib/wizwar
+#   snapshots/  - one dated copy per day, pruned after 90 days
+# Ledgers are append-only JSONL; the game server never needs stopping.
+set -u
+BUCKET="kestrel-wizwar-backups"
+SRC="/var/lib/wizwar"
+LOG="/var/log/wizwar/backup.log"
+STAMP=$(date +%Y-%m-%d)
+
+if grep -q CHANGE_ME /root/.config/rclone/rclone.conf; then
+  echo "$(date -Is) skipped: Spaces credentials not configured yet" >> "$LOG"
+  exit 0
+fi
+
+{
+  echo "=== $(date -Is) backup start"
+  rclone sync "$SRC" "spaces:$BUCKET/wizwar/current" 2>&1
+  rclone copy "$SRC" "spaces:$BUCKET/wizwar/snapshots/$STAMP" 2>&1
+  # Prune dated snapshots older than 90 days (by directory name).
+  CUTOFF=$(date -d "90 days ago" +%Y-%m-%d)
+  rclone lsf "spaces:$BUCKET/wizwar/snapshots/" --dirs-only 2>/dev/null | \
+  while read -r d; do
+    day="${d%/}"
+    if [[ "$day" < "$CUTOFF" ]]; then
+      echo "pruning snapshot $day"
+      rclone purge "spaces:$BUCKET/wizwar/snapshots/$day" 2>&1
+    fi
+  done
+  echo "=== $(date -Is) backup done"
+} >> "$LOG"