每隔2天，在01：30自动备份脚本：
/system scheduler add disabled=no interval=2d name=autobak on-event=\ "/ file remove autobak.backup\r\ \n/ system backup save name=autobak" policy=\ ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive,api \ start-date=jan/04/2013 start-time=01:30:00