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AWS Certified Solutions Architect - Professional · AWS
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Why the others don’t fit A (snapshots every 5 min + copy): Snapshot + copy timing is not guaranteed to meet RPO < 5 min, and restoring 10 TB will almost certainly miss RTO < 10 min. C (two Aurora clusters + DMS): Works, but more expensive (two clusters plus DMS replication cost/ops). D (same-Region read replica): Doesn’t meet the requirement to fail over to a secondary Region.
Dms would be more expensive, but compared to B, it meets better the RPO. The RPO is of 5 mins, and a read replica lag could easily go over 5mins (especially in a cross-region scenario). When you promote a read replica there is the possibility to lose data because of the lag. I would go for C if the RPO would be higher.
Sorry, I wanted to say "I would go for B if the RPO would be higher."