1、先创建backup文件夹
cd /var/opt/mssql/
mkdir ./backup
2、修改backup文件夹的文件归属和分组
chown mssql:mssql ./backup
3、执行备份语句,利用sqlcmd命令执行
BACKUP DATABASE yourDB
TO DISK = '/var/opt/mssql/backup/yourDB2018-2-6.bak'
WITH FORMAT;
GO