I created a snapshot of an instance on OpenStack using the web interface Horizon. I see that the image size is 59.5 GB:
I am surprised because the instance's disk was pretty empty:
and the RAM mostly unused:
How comes the image size is so large in comparison with the disk/RAM usage? (59.5 GB)
This instance size was was pretty big: 16core | 64GB RAM | 16 VCPU | 64.0GB Disk. Is the the image size impacted by the instance size, and if so why?