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Comment by hathym | Hacker News Reader

Does anyone know of an easy way to create a snapshot of the hard drive on linux? if anything go wrong you can back back and restore it back.

Clonezilla and an external drive

Not exactly an answer to your question but Linux Mint's Timeshift has saved me a couple times.

dd if=/dev/sda of=/mnt/other/foo.img bs=1M

and perhaps filter through gzip or something...

If you're using lvm or zfs it's trivial.

If not, you're probably going to have to take a backup the old fashioned way.

  # dd if=/dev/sdX bs=4k status=progress conv=noerror | zstdmt - > /mnt/backup.zstd

Timeshift