HarmonyOS 鸿蒙Next使用数据迁移工具后备份目录为空问题 /data/storage/el2/base/.backup迁移成功但无数据

以下文档搜索“备份恢复目录获取方式”：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/backupextensionability-implementation-V5

应用接入数据备份恢复： https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/app-file-backup-extension-V5

EntryBackupExtAbility.ets 实现可参考

import BackupExtensionAbility, { BundleVersion } from '@ohos.application.BackupExtensionAbility';
import { contextConstant } from '@kit.AbilityKit';
import { fileIo } from '@kit.CoreFileKit';
const TAG = BackupExtensionAbility;
export default class BackupExtension extends BackupExtensionAbility {
onBackup() {
console.log(TAG, onBackup ok);
}
// onRestore 接口是同步接口，其内部所有的异步操作请进行同步等待。
async onRestore(bundleVersion: BundleVersion): Promise<void> {
console.log(TAG, onRestore ok ${<span class="hljs-built_in"><span class="hljs-built_in">JSON</span></span>.stringify(bundleVersion)});
if (bundleVersion.name.startsWith(“0.0.0.0”)) {
// 在此处实现终端设备从HarmonyOS 4.0升级到HarmonyOS NEXT后，应用数据的转换和迁移
// 涉及异步操作请进行同步等待
  <span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.context.area = contextConstant.AreaMode.EL2;
  <span class="hljs-keyword"><span class="hljs-keyword">let</span></span> ceSourcePath = <span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.context.backupDir + <span class="hljs-string"><span class="hljs-string">"restore/{APK包名}/ce/"</span></span>
  <span class="hljs-keyword"><span class="hljs-keyword">let</span></span> destEl2Path = <span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.context.filesDir;
  <span class="hljs-keyword"><span class="hljs-keyword">try</span></span> {
    fileIo.copyDirSync(ceSourcePath, destEl2Path, <span class="hljs-number"><span class="hljs-number">1</span></span>)
    console.log(TAG, `copyEl2Dirsuccess`);
  } <span class="hljs-keyword"><span class="hljs-keyword">catch</span></span> (error) {
    console.log(TAG, `copyEl2Dirfail`);
  }

  console.log(TAG, `HarmonyOS to HarmonyOS NEXT scenario`);
} <span class="hljs-keyword"><span class="hljs-keyword">else</span></span> {
  <span class="hljs-comment"><span class="hljs-comment">// 在此处实现从HarmonyOS NEXT设备迁移到HarmonyOS NEXT设备后，应用数据的处理。无特殊要求，可以空实现</span></span>
  <span class="hljs-comment"><span class="hljs-comment">// 涉及异步操作请进行同步等待</span></span>

  console.log(TAG, `Other scenario`);
}
}
}
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