With Linux It's really pointless to make disk image backups. What you
really want is something to backup your virtual filesystem that is
attribute-aware. Traditionally that UNIX 'tar' utility has been used
for this purpose. Simply tarball your whole system excluding pseudo
filesystems like /proc, /sys, /dev, and /tmp then compress and store
the resulting .tar file. Alternatively there's Restic which is what I
use and it handles the compression, encryption, and de-duplication, and
snapshotting for you. All you have to do to restore from a
catastrophic failure is create a new filesystem, untar your files back
onto it (or use restic restore), and reinstall a bootloader.
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