diff --git a/lib/backup.ts b/lib/backup.ts
index 104bcc6..937093b 100644
--- a/lib/backup.ts
+++ b/lib/backup.ts
@@ -33,6 +33,7 @@ async function runBackup(): Promise<void> {
     const dump = spawn(dumpBin, [
       `-h${dbHost}`, `-P${dbPort}`, `-u${dbUser}`,
       '--skip-ssl',
+      '--default-auth=mysql_native_password',
       `--ignore-table=${dbName}.beos`,
       dbName,
     ], { env: { ...process.env, MYSQL_PWD: dbPass } });
@@ -44,13 +45,21 @@ async function runBackup(): Promise<void> {
     gzip.stdout.pipe(file);
 
     let dumpErr = '';
+    let dumpCode: number | null = null;
     dump.stderr.on('data', (d: Buffer) => { dumpErr += d.toString(); });
     dump.on('error', reject);
     gzip.on('error', reject);
     file.on('error', reject);
+    dump.on('close', (code) => {
+      dumpCode = code;
+      if (code !== 0) gzip.stdin.end();
+    });
     file.on('close', () => {
-      if (dumpErr.trim()) console.log('[backup] dump stderr:', dumpErr.trim());
-      resolve();
+      if (dumpCode !== 0) {
+        reject(new Error(`${dumpBin} exit ${dumpCode}: ${dumpErr.trim()}`));
+      } else {
+        resolve();
+      }
     });
   });