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.
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[ 3.4 ms ] story [ 17.1 ms ] threadWrote a piece on building a mental model for qcow2 overlays.