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2 semi-identical VMs, different back up speed

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Hello,
I got a 2 Linux VM Server on the same node with following setup.
VM 1
====
CPU = 1
RAM = 4gb
Allocated HDD = 400GB (virtio)
Used Space = 55GB
Backup Time = 2 hr 38 mins

VM 2
====
CPU = 1
RAM = 1GB
Allocated HDD = 200GB
Used Space = 115GB
Backup Time = 1 hr 35 mins

My question is, even though VM 2 has more data to back up, it actually finishes full back up faster than VM 1, why is that? Is it because the allocated virtual drive is larger in the VM 1?

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