Number of changed block

Hi all,

I have a question about number of changed blocks when I delete data inside VM.

For example, when I delete 100GB of data inside windows VM, I remember that windows only marks those block as rewriteable, not actually delete data. So when I delete a huge amount of data, number of changed blocks are still small? Am I right?

I have a report of free space inside VM (1-hour interval), can anyone advise me to calculate network bandwidth for replication?

Thank you so much.

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