Partclone

The Free and Open Source Software for Partition Imaging and Cloning

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Source

Debian/Ubuntu Package

Clonezilla

You can use Clonezilla which is an integrated tool to image and clone your disk or partition. Clonezilla, based on DRBL, partclone, and udpcast, allows you to do bare metal backup and recovery. For more info, please visit Clonezilla website.