In the archive configuration, which service runs on a Recorder or standalone Central Archive service...

The Recorder Archiver Service is a service that runs on a Recorder or standalone Central Archive service and performs the actual archive activity. It is responsible for moving the recordings from the Recorder to the Archive Database and Content Server, as well as deleting the recordings from the Recorder after they are archived. The Recorder Archiver Service also handles the encryption and decryption of the recordings, if enabled1 References: 1: Avaya Workforce Engagement Support - Archive Configuration Guide, page 9