I just wanted to take a quick poll. STH forums run in their own Ubuntu VM using ZoL with Proxmox/ Debian as the base hypervisor distro. The volume has a total size of 40GB. Here is my crazy question for you: day to day snapshots how much data changes? Code: zfs send -nv -i sasarray1/vm-102-disk-1@sthforum20151209 sasarray1/vm-102-disk-1@sthforum20151210 What is the total estimated size ______? I have to say, I was a bit surprised at first. It does at least give some idea how much data is changing on the disks daily.