RDS 5.7的物理备份恢复到本地的方法
https://yq.aliyun.com/articles/688509
备份MySQL数据
https://help.aliyun.com/document_detail/98818.html?spm=a2c4g.11186623.6.684.5660568arTX6qQ
RDS for MySQL 物理备份文件恢复到自建数据库
https://help.aliyun.com/knowledge_detail/41817.html?spm=a2c4g.11186631.2.1.434247acfAIAwY
RDS for MySQL 逻辑备份文件恢复到自建数据库