备份分区，备份文件切割保存 dd

　　

cd /tmp  
wget dl.fedoraproject.org/pub/epel/6/x86_64/dcfldd-1.3.4.1-4.el6.x86_64.rpm  
sudo yum install dcfldd-1.3.4.1-4.el6.x86_64.rpm  
dcfldd --version

备份分区 分割保存

dcfldd if=/dev/sdc of=/tmp/SD-Card-Backup.img

dcfldd if=/dev/sdc | split -b 3800MB - /tmp/SD-Card-Backup.img

恢复分区

dcfldd of=/dev/sdc if=/tmp/SD-Card-Backup.img

cat /tmp/SD-Card-Backup.img* | dcfldd of=/dev/sdc

dcfldd if=BerryBoot.img bs=1M status=progress | tee >(dcfldd of=/dev/sdc) | dcfldd of=/dev/sdd

验证数据

diff /dev/sdc /tmp/SD-Card-Backup.img

Via:  如何备份一个磁盘分区