That seems like it would burn a lot of space on store file snapshots to replay the relevant WAL atop. Did they integrate with an underlying filesystem's snapsh

That seems like it would burn a lot of space on store file snapshots to replay the relevant WAL atop. Did they integrate with an underlying filesystem's snapshotting feature to make the store file snapshots differentials, or was that also implemented in the database? Or just threw space at the problem?