diff --git a/deploy/termux-backup.sh b/deploy/termux-backup.sh
new file mode 100755
index 0000000..dfb4b8f
--- /dev/null
+++ b/deploy/termux-backup.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Daily SQLite backup: VACUUM INTO a timestamped copy, keep 7 days.
+# Usage: ./deploy/termux-backup.sh  (run from repo root; safe while live)
+# Termux has no cron, so run this from Termux:Tasker, a daily alarm via
+# Termux:API, or manually. One line, one snapshot.
+cd "$(dirname "$0")/.."
+OUT="./backups/whaleprep-$(date +%F).db"
+mkdir -p ./backups
+sqlite3 ./whaleprep.db "VACUUM INTO '$OUT';"
+ls -t ./backups/whaleprep-*.db | tail -n +8 | xargs -r rm -f
+echo "backup -> $OUT ($(du -h "$OUT" | cut -f1))"