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A source bucket is a bucket in ECS. The data movement policy scan job leverages Metadata (MD) Search to scan the source bucket to enumerate all candidate objects for data movement. Copy to Cloud requires that MD Search must be enabled on the source bucket and include LastModified as an indexed field, as shown in Figure 2.
MD Search is not automatically enabled on a bucket. Any existing buckets with MD Search disabled cannot be used as source buckets in the data movement policy.
S3 versioning can be used on the source bucket but it is not required for Copy to Cloud. When S3 versioning is enabled on the source bucket, Copy to Cloud only copies the current version as of the data movement policy execution time.
ECS automatically creates an IAM role with a set of permissions for any source bucket. These IAM roles are separate per source bucket, with in-line policies. ECS will not clean up any roles for data movement policy removal: you can remove the roles as needed.