The following command creates a complete compressed disk snapshot of /dev/sda
.
Replace 500107862016
with the size of the media to be backed up so pv shows progress information.
Runs at a speed of about 30MB/s for me. When using pigz
instead of gzip
for compression I can achieve speeds of around ~150MB/s (using SSDs).
dd if=/dev/sda conv=sync,noerror bs=64M | pv -s 500107862016 -pera | pigz -c > /media/user/backup.gz