Disk backup

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Dump the entire disk and compress

Compress with highest possible compression rate (-z9e) and highest possible thread number (T4). If not sure how many threads are available use T0

# dd if=/dev/nvme0n1 status=progress | xz -z9eT4 > /mnt/target/20250321_nvme0n1.xz
xz: Reduced the number of threads from 8 to 3 to not exceed the memory usage limit of 3831 MiB
3733861376 bytes (3.7 GB, 3.5 GiB)  copied, 524 s, 7.1 MB/s

Restore the entire disk

# xz -dc /mnt/source/20250321_nvme0n1_hp_840G6.xz | dd of=/dev/nvme0n1 status=progress

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