root@aml:~# ddbr
DO YOU WANT TO BACKUP OR RESTORE ?
BACKUP=(b) RESTORE=(r) r
AVAILABLE DEVICES: mmcblk1 sda1 sda2
YOU ARE RUNNING stretch FROM sda2
DID YOU USED COMPRESSION WHEN YOU TOOK THE BACKUP ?
YES=(y) NO=(n) n
YOU ARE ABOUT TO MAKE SERIOUS CHANGES TO YOUR SYSTEM!!!
FILE /ddbr/-emmc.img IS GOING TO BE WRITEN TO mmcblk1
MAKE SURE EVERYTHING LOOKS OK AND:
PRESS ENTER TO CONTINUE OR CTRL+C TO CANCEL
RESTORING /ddbr/-emmc.img TO /dev/mmcblk1 | PLEASE WAIT...
2801664+0 records in2MiB/s] [==========================> ] 18% ETA 0:09:17
2801664+0 records out
1434451968 bytes (1.4 GB, 1.3 GiB) copied, 124.687 s, 11.5 MB/s
1.34GiB 0:02:04 [ 11MiB/s] [==========================> ] 18%
2801664+0 records in
2801664+0 records out
1434451968 bytes (1.4 GB, 1.3 GiB) copied, 125.823 s, 11.4 MB/s
JOB FINISHED!
最后编辑：2021年11月16日
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恢复的时候用上面这个。
dd if=/dev/mmcblk1 of=/backup/backup.img bs=4M
没有用，扩容以后不好用了！
最后用的是这条语句。
dd if=/backup/backup.img of=/dev/mmcblk1 bs=4M