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Sunday, incremental backup is made
Monday, incremental backup is made
Tuesday, we needed to return back the snapshot of VBR guest OS to Sunday (snapshot reverts everything - system AND backup storage)
On Tuesday, incremental backup is made. Increment between Sunday and Tuesday. But the backed-up guests know that they have been backed-up on Monday and (presumably) tracking changed blocks since.
How can they pass throught VSS writer the correct data about difference between Sunday and Tuesday, while the last snapshot was on Monday?
Yes they passed the correct data, at least SureBackup is able to run from them:)