Snapshot restore to test server

Im a bit confused about the ES restore process.

I have a prod cluster and stage cluster.

Prod cluster has daily snapshots enabled.

The first time when I restored the snapshot from the prod backup it took a lot more time to restore(due to the size 2TB)

Then the next day prod completed the snapshot(its incremental in nature), so not much changes. Snapshot done in a few mins.

Then on the stage server, I closed the indices and restored the snapshot, this is also quick.

This is what I want to understand. We have done so many changes on the stage server, so I think it has to restore the full data. How it'll identify yesterday's full backup state and only replace them?

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