你是备份到aws里面吗？
原来有人也报过类似的错
br backup full 报错 - TiDB 的问答社区 (asktug.com)
而且我看你的备份报错里面还有这个关键字
[err_code=KV:Unknown] [err=“Io(Custom { kind: Other, error: “failed to put object rusoto error Error during dispatch: error trying to connect: tcp connect error: Connection timed out (os error 110)” })”]