No way.
VM backup includes 3 stages:
1) take snapshot, so vmdk and current deltas become RO
2) copy vmdk, vmx and current deltas
3) delete snapshot, i.e. commit changes happened after 1)
vmkfstools is not involved at all.
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MCSA, MCTS, VCP, VMware vExpert '2009
http://blog.vadmin.ru
EMCCAe, HPE ASE, MCITP: SA+VA, VCP 3/4/5, VMware vExpert XO (14 stars)
VMUG Russia Leader
http://t.me/beerpanda