在linux虚拟机上备份树莓派镜像
1 在官网https://www.raspberrypi.org/downloads/raspbian/ 下载Raspbian Stretch Lite
2 安装vm虚拟机
3 安装Raspbian系统，系统内存应大于需要备份镜像的3倍，建议30G以上
4 将需要备份的镜像sd卡插到电脑上（用读卡器）
5 将rpi-backup克隆到虚拟机里
6 df -h查看sd卡是否挂载为sdb，如果不是要修改代码里sdb相应的地方
7 sudo chmod +x rpi-backup
8 sudo ./rpi-backup
1 将此脚本设置为开机自启且添加可执行权限
2 通过backup备份后，备份后的镜像就会自动扩容
1 镜像备份到u盘（非本机）
2 树莓派本身系统备份（非u盘）
3 自动识别要备份的u盘系统（优化步骤6）
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