This tools enable you to recover single qcow2/raw from proxmox backup server fast.
Read chunks in parallel and write to target device in serial
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set up target device
modprobe nbd qemu-img create -f qcow2 victim.qcow2 100G qemu-nbd -c /dev/nbd0 victim.qcow2 --discard=unmap --detect-zeroes=unmap --aio=io_uring
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run
./pbsfastrestore -src /mnt/datastore/backup/pbs/dev/vm/123/2023-12-31T19:00:06Z/drive-scsi4.img.fidx -dest /dev/nbd0 -chunks /mnt/datastore/backup/pbs/dev/.chunks/ -workers 8