Windows 10qcow2 -

virsh snapshot-create-as win10 clean-state "After Windows activation" virsh snapshot-revert win10 clean-state Create a base image that never changes:

qemu-img check -r all windows10.qcow2 If your Windows 10 qcow2 runs out of space: windows 10qcow2

Using virt-install (command line):

Whether you convert an existing VM or build one from an ISO, mastering the qcow2 format will save you terabytes of storage and hours of reinstallation time. Remember to always use trusted sources, keep VirtIO drivers updated, and leverage backing files for scalable deployments. keep VirtIO drivers updated