Scripting
DD To 7 Zip
How to image your drive using dd and 7Zip
This is to allow compressing / decompressing on the fly so you minimise storage used
Compress:
sudo dd if=/dev/sdb bs=32M |7z a -si archive.img.7z
Decompress:
7z e -so archive.img.7z archive.img | sudo dd of=/dev/sdb bs=32 status=progress