**Limitations**: (1) Delta optimized for single cloud (S3, ADLS, GCS). (2) No native cross-cloud sync. (3) Format compatibility across vendors (AWS vs Azure vs GCP) generally good but storage APIs differ. (4) Cross-cloud read/write = network egress cost. (5) Unity Catalog multi-cloud evolving.
**Mitigation**: Replicate at storage level (S3 cross-region, etc.). Lakehouse federation. Design for primary cloud; DR replica in second.
**Scalability Trade-offs**: Cross-cloud latency and cost....
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