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I see virt-manager can make snapshots if qcow2 is used. I also see a "save" button.

Suppose I want to save a machine, is it ok to do save and maybe at reboot (of host, not guest) I can resume the machine?

Or I have to make a snapshot?

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The managed save option of virt-manager pauses the guest and dumps its memory (and CPU state) to a save file. The corresponding start reloads the guest so that it can continue on from where it left off.

This works with Linux-based guests but I can say that empirically it does not work with Windows-based guests (they don't successfully restart).

virsh managedsave {guest}
...
virsh start {guest}

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