版本 oceanbase-all-in-one-4.0.0.0-100120230113164218.el7.x86_64 (1).tar
配置好nfs，配置路径报错：
obclient [oceanbase]> alter system set backup_dest=‘file:///nfs/backup’;
ERROR 5099 (42000): System config unknown
尝试直接备份报错：
obclient [oceanbase]> alter system backup database;
ERROR 9040 (HY000): backup can not start, because no tenant meets the backup condition, please check the tenant status, log archive status, backup data dest, and backup status for each tenant
单机测试备份应该是不支持吧？
备份需要在system租户下才可以进行备份,在用户租户下面备份不可用