–storage “s3://${backup_collection_addr}/snapshot-${date}?access-key=${access-key}&secret-access-key=${secret-access-key}” \ 共享存储备份目录
–storage “local:///home/tidb/backupdata”\ 每个TiKV节点都存在相关目录（没有需要创建）并且要有读写权限777
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