Incremental data size is huge in VMware backup

I am evaluating VMBackup product and so far i am happy with my test results.

I am backing up 2 VMs from ESXi host and i noticed that huge size of backup data has been transferred during incremental when there is no new changes in that 2 VMs. Is this normal one? I believe you guys are using VMware CBT to perform incremental. Please advice on this.

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