直接在底层挂在然后备份到本地或者其他分区即可
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 30G 0 disk
**─sda1 8:1 0 94M 0 part
**─sda2 8:2 0 29.9G 0 part /
sdb 8:16 0 20G 0 disk
**─sdb1 8:17 0 20G 0 part
**─md0 9:0 0 20G 0 raid1
**─trim_2f8efe58_4453_430d_9e3b_f733b2cadf0c-0 253:0 0 20G 0 lvm
sr0 11:0 1 1.6G 0 rom
尝试挂载
mkdir -p /tmp/fn_test
mount -o ro,usebackuproot /dev/mapper/trim_2f8efe58_4453_430d_9e3b_f733b2cadf0c-0 /tmp/fn_test
拷贝
mkdir 飞牛备份 && cd 飞牛备份 #创建备份目录
scp -r root@192.168.6.192:/tmp/fn_test/ ./ #将分区内容备份到本地