KVM / libvirt NVMe VM backup script love! This is what i do: 1) create drive overlay to fix the backup disk file 2) tar.gz it with 8 threads using pigz 3) write packed output stream directly to backup disk at 70MByte/s 4) when done, remove overlay again
This manages to back up all my running VMs without interruption, 1.3TB unzipped, <400GB zipped, in <2h.
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