SD card backup and restore - cjus/hydra-cluster GitHub Wiki

After configuring your Pis you're going to want to backup the modified SD's!

Here are instructions for Mac users:

Backup disk image

Find out where the SD card is mounted:

$ diskutil list

Back from mount point to disk image:

$ sudo dd if=/dev/disk2 of=./backup-image.dmg

Flash a disk image

Find out where the SD card is mounted:

$ diskutil list

Unmount the disk:

$ diskutil unmountDisk /dev/disk2

Write the backup onto the disk:

$ sudo dd bs=1m if=2016-09-23-raspbian-jessie-lite.img of=/dev/disk2

Checking progress

The above operations can take a while to complete. You can press Ctrl-T to send a SIGINFO signal which will cause DD to display it's current status.