We use QEMU for our sandbox infra. QEMU comes with qcow2 (copy-on-write), a native disk image format. It allows the VM to only write changes to disk which saves

We use QEMU for our sandbox infra. QEMU comes with qcow2 (copy-on-write), a native disk image format. It allows the VM to only write changes to disk which saves time and space specially if you want to snapshot and restore changes. Wrote a piece on building a mental model for qcow2 overlays.