Hi @ACWCalvinWong,
Unfortunately BlueXP Copy and Sync cannot run in isolated/dark-sites/private/disconnected environments as it is a SaaS platform.
"BlueXP copy and sync is a software-as-a-service (SaaS) platform that consists of a data broker group, a cloud-based interface available through BlueXP, and a source and target."
I do wish that this platform could be brought on premises to work within dark sites! Come on NetApp!!