We still have to migrate AutoFlight to the new server, which we can hopefully do before end of this week. Until then I recommend not to remove anything from the rack. After Autoflight was successfully migrated we can remove GLSERVER and both Nicos switches. I will let you know, when we are ready.
Only Autoflight is still active on GLSERVER. If you copy the AutoFlight database somewhere else for backup you will not need the External HD anymore.