container memory

Proxmox newbie here, although I have been using it for Home Assistant for a couple of years, but almost a set and forget aside from updates. I recently moved Omada from my Synology NAS to Proxmox on a newish Lenovo mini because the new Omada versions won't run on a Celeron CPU. The used memory...

I have a CT with 512mb ram and after boot it only uses 128mb or so. When I copy a large amount of data to the CT the memory maxes out at 512mb After the copy has completed the memory in use remains at 512mb If I reboot the CT the memory in use returns to 128mb