add back-db.js

backup-db.js

@@ -0,0 +1,14 @@
+#!/usr/bin/env node
+
+const path = require('path')
+const {db} = require('./db')
+
+const filepath = path.join(__dirname, 'backup', `${Date.now()}.sqlite`)
+
+db.backup(filepath)
+  .then(() => {
+    console.log(filepath)
+  })
+  .catch((err) => {
+    console.log('backup failed:', err)
+  })