没有测试改成1副本，我看我们月份中最大是40TB，这个大小可以承受。
我只单机测试了下330M的CSV文件，导入TIDB后再备份是218M。还变小了
Full Restore <--------------------------------------------------------> 100.00%
[2023/12/12 18:18:51.894 +08:00] [INFO] [collector.go:77] [“Full Restore success summary”] [total-ranges=18] [ranges-succeed=18] [ranges-failed=0] [split-region=560.858µs] [restore-ranges=9] [total-take=30.111860743s] [total-kv=4800002] [total-kv-size=510.4MB] [average-speed=16.95MB/s] [restore-data-size(after-compressed)=218.6MB] [Size=218606969] [BackupTS=446267079807991814] [RestoreTS=446267733424734212]