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from: https://aws.amazon.com/blogs/aws/cross-region-snapshot-copy-for-amazon-rds/
As is the case with the other copy operations, the copy is done on an incremental basis, and only the data that has changed since the last snapshot of a given Database Instance will be copied. When you delete a snapshot, deletion is limited to the data that will not affect other snapshots.
For second part - Yes, The RDS system will ensure that the last snapshot has all the available data and the previous snapshots are not required
answered 8 years ago
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