update zh-cn/application-dev/file-management/app-file-backup-extension.md.

Signed-off-by: N 葛亚芳 <geyafang@huawei.com>

update zh-cn/application-dev/file-management/app-file-backup-extension.md.
Signed-off-by: N 葛亚芳 <geyafang@huawei.com>
cf17992d · 葛亚芳 · Gitee · b59e1ed9 · cf17992d
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@@ -78,3 +78,9 @@ BackupExtensionAbility，是[Stage模型](../../application-dev/application-mode
    ]
 }
 ```
+
+## 相关实例
+
+针对应用接入数据的备份与恢复，有以下相关实例可供参考：
+
+- [应用接入数据备份恢复（ArkTS）（Full SDK）（API10）](https://gitee.com/openharmony/applications_app_samples/tree/master/code/BasicFeature/FileManagement/FileBackupExtension)
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