Answer
Use IFS's own instance backup-and-restore-as-clone tooling rather than manually reinstalling every historical delivery: locate the create_backup.cmd file under the existing source instance's own instance\<name>\bin folder (checking the technical documentation, or the command file itself, for its exact parameters) to back up the source instance, and use its corresponding restore-as-clone command to extract and restore that backup as a new instance under a different target name. This clones the existing, already-up-to-date instance directly under a new name, rather than needing to reapply the full delivery history manually against a fresh base install.