A company uses server-side encryption with AWS KMS keys SSE-KMS to encrypt objects that the...

S3 replication is the right service because it is the native mechanism for automatically copying objects to another bucket, including buckets in another AWS account. AWS documentation also states that to replicate SSE-KMS encrypted objects, you must grant additional permissions in the replication configuration, which aligns with the scenario’s KMS setup. The requirement for availability within several minutes points directly toS3 Replication Time Control, which AWS says replicates most objects in seconds and 99.9% within 15 minutes. The replicated objects remain in S3 and are immediately accessible in the destination bucket. AWS Backup and Batch Operations do not provide the same near-real-time replication behavior for newly written objects. Therefore, cross-account S3 replication with S3 RTC is the best answer. (AWS Documentation)

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