Ok, so snapshot 1 is taken at 12pm, provides a copy of the database, RowA at that point in time.
Row A is modified at 12:15pm, snapshot 1 will not capture that update?
Row A is again modified at 12:30pm
Snapshot 2 is taken at 1pm, snapshot 2 will capture both Row A mods, 12:15pm + 12:30pm. Snapshot 1 would only capture mods prior to 12pm?