Partclone
From ArchWiki
Partclone, like the well-known Partimage, can be used to back up and restore a partition while considering only used blocks. In Arch Linux, Partclone can deal with the following file systems: ext2, ext3, ext4, reiserfs, hfs+, fat and ntfs.
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Installation
Partclone is available in the AUR as partclone and partclone-svn.
Using Partclone with an ext4-formatted partition
Without compression
To backup without compression:
$ partclone.ext4 -c -s /dev/sda1 -o ~/image_sda1.pcl
To restore it:
$ partclone.ext4 -r -s ~/image_sda1.pcl -o /dev/sda1
With compression
To backup with compression:
$ partclone.ext4 -c -s /dev/sda1 | gzip -c > ~/image_sda1.pcl.gz
Note: For maximum compression use "gzip -c9"
To restore it:
zcat ~/image_sda1.pcl.gz | partclone.ext4 -r -o /dev/sda1