Object copy operations

Object copy operations run in parallel with source vault listing operations. The migration agents will start to copy objects as soon as there are items found in the migration work queue. If a new version of an object is written to the target vault before the object has been migrated the older version on the source will not be migrated. If an object is deleted by the user during migration, it will not be migrated. User-defined object metadata, last modified time, object ACLs, and all S3 versions are preserved. If a S3 multipart upload is completed during a migration, the object will be migrated.