I have successfully copied my 190Gb Aperture vault to my MyCloud Mirror.
It tooks 2 days.
The copy is complete (i have unmounted the source drive which was a WD MyBook 1TB in one of the USB ports on the MCM), butt he activity lights are still running 12 hours later - is this ‘indexing’ the Vault?
And, can anyone confirm that the MCM will successfully operate as an Aperture Vault? I saw an older post suggesting that there might be an incompatibility - in which case it will go back to the seller…