Simple copying one SSD to another one. Make sure about the sda and the sdb for not clone on oposite way, somentimes the sdb is the main one:

dd if=/dev/sda of=/dev/sdb bs=32M

Some blogs says to add status=progress for see the progress but I never tested.

==========================================

Skipping the erros:

dd if=/dev/sda of=/dev/sdb bs=4096 conv=sync,noerror

This will copy the disk, and skip blocks with errors, which is very important.
These are the basic and essential options for using dd to clone or rescue a disk.

=========================================
Export and after import:

To save space, you can compress data produced by dd with gzip, e.g.:

dd if=/dev/hdb | gzip -c  > /image.img.gz

You can restore your disk with:

gunzip -c /image.img.gz | dd of=/dev/hdb

To save even more space, defragment the drive/partition you wish to clone beforehand (if appropriate), then zero-out all the remaining unused space, making it easier for gzip to compress:

mkdir /mnt/hdb
mount /dev/hdb /mnt/hdb
dd if=/dev/zero of=/mnt/hdb/zero

Wait a bit, dd will eventually fail with a “disk full” message, then:

rm /mnt/hdb/zero
umount /mnt/hdb
dd if=/dev/hdb | gzip -c  > /image.img.gz

Also, you can get a dd process running in the background to report status by sending it a signal with the kill command, e.g.:

dd if=/dev/hdb of=/image.img &
kill -SIGUSR1 1234