Using the in-box Microsoft VSS provider, is there a way to query only what has changed between an 'n' and 'n+1' snapshot? When I do a vssadmin -q I see that all of the snaps my system has taken are marked 'differential'. But my understanding of differential is that it is relative to a full, or base, snapshot. I do not see any such snapshot - every one is marked differential. So I'm not sure if I'm just misunderstanding what differential means in this context or what. Further, even if these are differential in terms of their behind-the-scenes allocation/implementation, is this metadata exposed to the user in any way? I'd like to perform remote backups to sync a series of local VSS snapshots, but obviously do not want to re-backup the entire volume on each subsequent snap if it hasn't changed. I believe 'incremental' is what I'd ideally like to have achieve (though I can't determine whether the ITB provider supports this backup type) but differential would at least be better than doing full backups on each snapshot.
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