解决RouterOS备份错误“error creating backup file: could not read all configuration files”

执行/system backup save时，RouterOS提示错误“error creating backup file: could not read all configuration files”，执行以下命令可解决该备份错误：

/ip ssh regenerate-host-key

参考Mikrotik官方论坛：https://forum.mikrotik.com/viewtopic.php?t=133621