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 4、未完成部分：计划任务备份保留n天
 
 5、CentOS裸机部署教程：[https://www.bilibili.com/video/BV1nv411T79c?share_source=copy_web](https://www.bilibili.com/video/BV1nv411T79c?share_source=copy_web)
+
 6、宝塔面板部署教程：[https://www.bilibili.com/video/BV1XR4y1H7p3/](https://www.bilibili.com/video/BV1XR4y1H7p3/)
 
 # 一 系统部署